curl and libcurl 7.68.0

 Public curl releases:         187
 Command line options:         229
 curl_easy_setopt() options:   269
 Public functions in libcurl:  82
 Contributors:                 2056

This release includes the following changes:

 o TLS: add BearSSL vtls implementation [37]
 o XFERINFOFUNCTION: support CURL_PROGRESSFUNC_CONTINUE [36]
 o curl: add --etag-compare and --etag-save [31]
 o curl: add --parallel-immediate [29]
 o multi: add curl_multi_wakeup() [38]
 o openssl: CURLSSLOPT_NO_PARTIALCHAIN can disable partial cert chains [45]

This release includes the following bugfixes:

 o Azure Pipelines: add several builds
 o CMake: add support for building with the NSS vtls backend [43]
 o CURL-DISABLE: initial docs for the CURL_DISABLE_* defines [19]
 o CURLOPT_QUOTE.3: fix typos [78]
 o CURLOPT_URL.3: "curl supports SMB version 1 (only)"
 o CURLOPT_VERBOSE.3: see also ERRORBUFFER
 o HISTORY: added cmake, HTTP/3 and parallel downloads with curl
 o HISTORY: the SMB(S) support landed in 2014
 o INSTALL.md: provide Android build instructions [10]
 o KNOWN_BUGS: Connection information when using TCP Fast Open [85]
 o KNOWN_BUGS: LDAP on Windows doesn't work correctly [86]
 o KNOWN_BUGS: TLS session cache doesn't work with TFO [56]
 o OPENSOCKETFUNCTION.3: correct the purpose description [48]
 o altsvc: bump to h3-24 [6]
 o altsvc: make the save function ignore NULL filenames [67]
 o build: Disable Visual Studio warning "conditional expression is constant" [49]
 o build: fix for CURL_DISABLE_DOH [2]
 o checksrc.bat: Add a check for vquic and vssh directories [40]
 o checksrc: repair the copyrightyear check [25]
 o cirrus-ci: enable clang sanitizers on freebsd 13 [60]
 o cirrus: Drop the FreeBSD 10.4 build
 o config-win32: cpu-machine-OS for Windows on ARM [13]
 o configure: avoid unportable `==' test(1) operator [1]
 o configure: enable IPv6 support without `getaddrinfo` [44]
 o configure: fix typo in help text [4]
 o conncache: CONNECT_ONLY connections assumed always in-use [71]
 o conncache: fix multi-thread use of shared connection cache [61]
 o copyrights: fix copyright year range [25]
 o create_conn: prefer multiplexing to using new connections [76]
 o curl.h: add two missing defines for "pre ISO C" compilers [75]
 o curl/parseconfig: fix mem-leak [81]
 o curl/parseconfig: use curl_free() to free memory allocated by libcurl [80]
 o curl: fix --upload-file . hangs if delay in STDIN [35]
 o curl: fix -T globbing [16]
 o curl: improved cleanup in upload error path [69]
 o curl: show better error message when no homedir is found [47]
 o curl_setup_once: consistently use WHILE_FALSE in macros [54]
 o define: remove HAVE_ENGINE_LOAD_BUILTIN_ENGINES, not used anymore [83]
 o docs: Change 'experiemental' to 'experimental' [30]
 o docs: TLS SRP doesn't work with TLS 1.3 [87]
 o docs: fix several typos [62]
 o doh: improved both encoding and decoding [11]
 o doh: make it behave when built without proxy support [68]
 o examples: add multi-poll.c [14]
 o global_init: undo the "intialized" bump in case of failure [52]
 o hostip: suppress compiler warning [64]
 o http_ntlm: Remove duplicate NSS initialisation [55]
 o lib: Move lib/ssh.h -> lib/vssh/ssh.h [9]
 o lib: remove ASSIGNWITHINCONDITION exceptions, use our code style [84]
 o libssh2: add support for ECDSA and ed25519 knownhost keys [89]
 o multi: free sockhash on OOM [63]
 o multi_poll: avoid busy-loop when called without easy handles attached [15]
 o ngtcp2: fix thread-safety bug in error-handling [33]
 o ngtcp2: free used resources on disconnect [7]
 o ngtcp2: handle key updates as ngtcp2 master branch tells us [8]
 o ngtcp2: increase QUIC window size when data is consumed [12]
 o ngtcp2: use overflow buffer for extra HTTP/3 data [5]
 o ntlm: USE_WIN32_CRYPTO check removed to get USE_NTLM2SESSION set [3]
 o ntlm_wb: fix double-free in OOM [65]
 o openssl: Revert to less sensitivity for SYSCALL errors [26]
 o openssl: improve error message for SYSCALL during connect [27]
 o openssl: prevent recursive function calls from ctx callbacks [18]
 o openssl: retrieve reported LibreSSL version at runtime [50]
 o openssl: set X509_V_FLAG_PARTIAL_CHAIN by default [46]
 o parsedate: offer a getdate_capped() alternative [53]
 o pause: avoid updating socket if done was already called [22]
 o projects: Fix Visual Studio projects SSH builds [41]
 o projects: Fix Visual Studio wolfSSL configurations
 o quiche: reject HTTP/3 headers in the wrong order [17]
 o remove_handle: clear expire timers after multi_done() [20]
 o runtests: --repeat=[num] to repeat tests [91]
 o runtests: introduce --shallow to reduce huge torture tests [70]
 o schannel: fix --tls-max for when min is --tlsv1 or default [39]
 o setopt: Fix ALPN / NPN user option when built without HTTP2 [42]
 o strerror: Add Curl_winapi_strerror for Win API specific errors [51]
 o strerror: Fix an error looking up some Windows error strings
 o strerror: Fix compiler warning "empty expression" [79]
 o system.h: fix for MCST lcc compiler [23]
 o test/sws: search for "Testno:" header unconditionally if no testno [73]
 o test1175: verify symbols-in-versions and libcurl-errors.3 in sync [28]
 o test1270: a basic -w redirect_url test [82]
 o test1456: remove the use of a fixed local port number [77]
 o test1558: use double slash after file: [21]
 o test1560: require IPv6 for IPv6 aware URL parsing [24]
 o tests/lib1557: fix mem-leak in OOM [66]
 o tests/lib1559: fix mem-leak in OOM [66]
 o tests/lib1591: free memory properly on OOM, in the trailers callback [90]
 o tests/unit1607: fix mem-leak in OOM [66]
 o tests/unit1609: fix mem-leak in OOM [66]
 o tests/unit1620: fix bad free in OOM [66]
 o tests: fix build with `CURL_DISABLE_DOH` [64]
 o tests: fix permissions of ssh keys in WSL [58]
 o tests: make it possible to set executable extensions [58]
 o tests: make sure checksrc runs on header files too
 o tests: set LC_ALL=en_US.UTF-8 instead of blank in several tests [74]
 o tests: use DoH feature for DoH tests [64]
 o tests: use \r\n for log messages in WSL [58]
 o travis: abandon coveralls, it is not reliable [57]
 o travis: build ngtcp2 with --enable-lib-only [32]
 o travis: export the CC/CXX variables when set [34]
 o vtls: make BearSSL possible to set with CURL_SSL_BACKEND [72]
 o winbuild: Define CARES_STATICLIB when WITH_CARES=static [59]
 o winbuild: Document CURL_STATICLIB requirement for static libcurl [88]
 o ngtcp2: Support the latest update key callback type [92]

This release includes the following known bugs:

 o see docs/KNOWN_BUGS (https://curl.haxx.se/docs/knownbugs.html)

This release would not have looked like this without help, code, reports and
advice from friends like these:

  3dyd on github, Anderson Sasaki, Andreas Falkenhahn, Andrew Ishchuk,
  bdry on github, Bjoern Franke, bxac on github, Bylon2 on github,
  Christian Schmitz, Christopher Reid, Christoph M. Becker, Cynthia Coan,
  Dan Fandrich, Daniel Gustafsson, Daniel Stenberg, David Benjamin,
  Gergely Nagy, Gisle Vanem, JanB on github, Javier Blazquez, Jeff Mears,
  Jeffrey Walton, John Schroeder, Kamil Dudka, Kunal Ekawde, Leonardo Taccari,
  Marcel Raad, Marc Hörsken, Maros Priputen, Massimiliano Fantuzzi,
  Max Kellermann, Melissa Mears, Michael Forney, Michael Vittiglio,
  Mohammad Hasbini, Niall O'Reilly, Paul Groke, Paul Hoffman,
  Paulo Roberto Tomasi, Pavel Löbl, Pavel Pavlov, Peter Wu, Ram Krushna Mishra,
  Ray Satiro, Richard Alcock, Richard Bowker, Santino Keupp, sayrer on github,
  Shailesh Kapse, SLDiggie on github, Steve Holme, Tatsuhiro Tsujikawa,
  Tom van der Woerdt, Victor Magierski, Vlastimil Ovčáčík, Wyatt O'Day,
  Xiaoyin Liu,
  (57 contributors)

        Thanks! (and sorry if I forgot to mention someone)

References to bug reports and discussions on issues:

 [1] = https://curl.haxx.se/bug/?i=4567
 [2] = https://curl.haxx.se/bug/?i=4565
 [3] = https://curl.haxx.se/bug/?i=3704
 [4] = https://curl.haxx.se/bug/?i=4570
 [5] = https://curl.haxx.se/bug/?i=4525
 [6] = https://curl.haxx.se/bug/?i=4604
 [7] = https://curl.haxx.se/bug/?i=4614
 [8] = https://curl.haxx.se/bug/?i=4612
 [9] = https://curl.haxx.se/bug/?i=4609
 [10] = https://curl.haxx.se/bug/?i=4606
 [11] = https://curl.haxx.se/bug/?i=4598
 [12] = https://curl.haxx.se/bug/?i=4600
 [13] = https://curl.haxx.se/bug/?i=4590
 [14] = https://curl.haxx.se/bug/?i=4596
 [15] = https://curl.haxx.se/bug/?i=4594
 [16] = https://curl.haxx.se/bug/?i=4588
 [17] = https://curl.haxx.se/bug/?i=4571
 [18] = https://curl.haxx.se/bug/?i=4585
 [19] = https://curl.haxx.se/bug/?i=4545
 [20] = https://curl.haxx.se/bug/?i=4575
 [21] = https://curl.haxx.se/bug/?i=4554
 [22] = https://curl.haxx.se/bug/?i=4563
 [23] = https://curl.haxx.se/bug/?i=4576
 [24] = https://curl.haxx.se/bug/?i=4556
 [25] = https://curl.haxx.se/bug/?i=4549
 [26] = https://curl.haxx.se/bug/?i=4624
 [27] = https://curl.haxx.se/bug/?i=4593
 [28] = https://curl.haxx.se/bug/?i=4628
 [29] = https://curl.haxx.se/bug/?i=4500
 [30] = https://curl.haxx.se/bug/?i=4618
 [31] = https://curl.haxx.se/bug/?i=4543
 [32] = https://curl.haxx.se/bug/?i=4646
 [33] = https://curl.haxx.se/bug/?i=4645
 [34] = https://curl.haxx.se/bug/?i=4637
 [35] = https://curl.haxx.se/bug/?i=2051
 [36] = https://curl.haxx.se/bug/?i=4599
 [37] = https://curl.haxx.se/bug/?i=4597
 [38] = https://curl.haxx.se/bug/?i=4418
 [39] = https://curl.haxx.se/bug/?i=4633
 [40] = https://curl.haxx.se/bug/?i=4607
 [41] = https://curl.haxx.se/bug/?i=4492
 [42] = https://curl.haxx.se/bug/?i=4668
 [43] = https://curl.haxx.se/bug/?i=4663
 [44] = https://curl.haxx.se/bug/?i=4662
 [45] = https://curl.haxx.se/bug/?i=4665
 [46] = https://curl.haxx.se/mail/lib-2019-11/0094.html
 [47] = https://curl.haxx.se/bug/?i=4644
 [48] = https://curl.haxx.se/mail/lib-2019-12/0007.html
 [49] = https://curl.haxx.se/bug/?i=4658
 [50] = https://curl.haxx.se/bug/?i=2425
 [51] = https://curl.haxx.se/bug/?i=4550
 [52] = https://curl.haxx.se/bug/?i=4636
 [53] = https://curl.haxx.se/bug/?i=4152
 [54] = https://curl.haxx.se/bug/?i=4649
 [55] = https://curl.haxx.se/bug/?i=3935
 [56] = https://curl.haxx.se/bug/?i=4301
 [57] = https://curl.haxx.se/bug/?i=4694
 [58] = https://curl.haxx.se/bug/?i=3899
 [59] = https://curl.haxx.se/bug/?i=4688
 [60] = https://curl.haxx.se/bug/?i=4557
 [61] = https://curl.haxx.se/bug/?i=4544
 [62] = https://curl.haxx.se/bug/?i=4680
 [63] = https://curl.haxx.se/bug/?i=4713
 [64] = https://curl.haxx.se/bug/?i=4692
 [65] = https://curl.haxx.se/bug/?i=4710
 [66] = https://curl.haxx.se/bug/?i=4709
 [67] = https://curl.haxx.se/bug/?i=4707
 [68] = https://curl.haxx.se/bug/?i=4704
 [69] = https://curl.haxx.se/bug/?i=4705
 [70] = https://curl.haxx.se/bug/?i=4699
 [71] = https://curl.haxx.se/bug/?i=4369
 [72] = https://curl.haxx.se/bug/?i=4698
 [73] = https://curl.haxx.se/bug/?i=4744
 [74] = https://curl.haxx.se/bug/?i=4738
 [75] = https://curl.haxx.se/bug/?i=4739
 [76] = https://curl.haxx.se/bug/?i=4732
 [77] = https://curl.haxx.se/bug/?i=4733
 [78] = https://curl.haxx.se/bug/?i=4736
 [79] = https://github.com/curl/curl/commit/5b22e1a#r36458547
 [80] = https://curl.haxx.se/bug/?i=4730
 [81] = https://curl.haxx.se/bug/?i=4731
 [82] = https://curl.haxx.se/bug/?i=4728
 [83] = https://curl.haxx.se/bug/?i=4725
 [84] = https://curl.haxx.se/bug/?i=4683
 [85] = https://curl.haxx.se/bug/?i=4296
 [86] = https://curl.haxx.se/bug/?i=4261
 [87] = https://curl.haxx.se/bug/?i=4262
 [88] = https://curl.haxx.se/bug/?i=4721
 [89] = https://curl.haxx.se/bug/?i=4714
 [90] = https://curl.haxx.se/bug/?i=4720
 [91] = https://curl.haxx.se/bug/?i=4715
 [92] = https://curl.haxx.se/bug/?i=4735