Release engineering changes for iperf-3.10 (#1151)

* Draft release notes for iperf-3.10.

* iperf-3.10 version number bumps.

* Update using autoupdate-2.71 from Xcode 12 on macOS Big Sur.

* Regen.

* docs: Add release notes for recent changes.
diff --git a/RELNOTES.md b/RELNOTES.md
index 21f0801..8ec26c7 100644
--- a/RELNOTES.md
+++ b/RELNOTES.md
@@ -1,6 +1,62 @@
 iperf3 Release Notes
 ====================
 
+iperf 3.10 2021-05-xx
+---------------------
+
+* Notable user-visible changes
+
+  * Fix a bug where some --reverse tests didn't terminate (#982 /
+    #1054).
+
+  * Responsiveness of control connections is slightly improved (#1045
+    / #1046 / #1063).
+
+  * The allowable clock skew when doing authentication between client
+    and server is now configurable with the new --time-skew-threshold
+    (#1065 / #1070).
+
+  * Bitrate throttling using the -b option now works when a burst size
+    is specified (#1090).
+
+  * A bug with calculating CPU utilization has been fixed (#1076 /
+    #1077).
+
+  * A --bind-dev option to support binding sockets to a given network
+    interface has been added to make iperf3 work better with
+    multi-homed machines and/or VRFs (#817 / #1089 / #1097).
+
+  * --pidfile now works with --client mode (#1110).
+
+  * The server is now less likely to get stuck due to network errors
+    (#1101, #1125), controlled by the new --rcv-timeout option.
+
+  * Fixed a few bugs in termination conditions for byte or
+    block-limited tests (#1113, #1114, #1115).
+
+  * Added tcp_info.snd_wnd to JSON output (#1148).
+
+  * Some bugs with garbled JSON output have been fixed (#1086, #1118,
+    #1143 / #1146).
+
+  * Support for setting the IPv4 don't-fragment (DF) bit has been
+    added with the new --dont-fragment option (#1119).
+
+  * A failure with not being able to read the congestion control
+    algorithm under WSL1 has been fixed (#1061 / #1126).
+
+  * Error handling and error messages now make more sense in cases
+    where sockets were not successfully opened (#1129 / #1132 /
+    #1136, #1135 / #1138, #1128 / #1139).
+
+  * Some buffer overflow hazards were fixed (#1134).
+
+* Notable developer-visible changes
+
+  * It is now possible to use the API to set/get the congestion
+    control algorithm (#1036 / #1112).
+
+
 iperf 3.9 2020-08-17
 --------------------
 
diff --git a/configure b/configure
index b1ef168..eaf42a7 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.71 for iperf 3.9+.
+# Generated by GNU Autoconf 2.71 for iperf 3.10.
 #
 # Report bugs to <https://github.com/esnet/iperf>.
 #
@@ -621,8 +621,8 @@
 # Identity of this package.
 PACKAGE_NAME='iperf'
 PACKAGE_TARNAME='iperf'
-PACKAGE_VERSION='3.9+'
-PACKAGE_STRING='iperf 3.9+'
+PACKAGE_VERSION='3.10'
+PACKAGE_STRING='iperf 3.10'
 PACKAGE_BUGREPORT='https://github.com/esnet/iperf'
 PACKAGE_URL='https://software.es.net/iperf/'
 
@@ -1364,7 +1364,7 @@
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures iperf 3.9+ to adapt to many kinds of systems.
+\`configure' configures iperf 3.10 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1435,7 +1435,7 @@
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of iperf 3.9+:";;
+     short | recursive ) echo "Configuration of iperf 3.10:";;
    esac
   cat <<\_ACEOF
 
@@ -1553,7 +1553,7 @@
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-iperf configure 3.9+
+iperf configure 3.10
 generated by GNU Autoconf 2.71
 
 Copyright (C) 2021 Free Software Foundation, Inc.
@@ -1831,7 +1831,7 @@
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by iperf $as_me 3.9+, which was
+It was created by iperf $as_me 3.10, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -3198,7 +3198,7 @@
 
 # Define the identity of the package.
  PACKAGE='iperf'
- VERSION='3.9+'
+ VERSION='3.10'
 
 
 printf "%s\n" "#define PACKAGE \"$PACKAGE\"" >>confdefs.h
@@ -15548,7 +15548,7 @@
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by iperf $as_me 3.9+, which was
+This file was extended by iperf $as_me 3.10, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -15617,7 +15617,7 @@
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-iperf config.status 3.9+
+iperf config.status 3.10
 configured by $0, generated by GNU Autoconf 2.71,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index beda7bf..88c3b11 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,7 +24,7 @@
 # file for complete information.
 
 # Initialize the autoconf system for the specified tool, version and mailing list
-AC_INIT([iperf],[3.9+],[https://github.com/esnet/iperf],[iperf],[https://software.es.net/iperf/])
+AC_INIT([iperf],[3.10],[https://github.com/esnet/iperf],[iperf],[https://software.es.net/iperf/])
 m4_include([config/ax_check_openssl.m4])
 m4_include([config/iperf_config_static_bin.m4])
 AC_LANG(C)
diff --git a/src/libiperf.3 b/src/libiperf.3
index a91e882..3155062 100644
--- a/src/libiperf.3
+++ b/src/libiperf.3
@@ -1,4 +1,4 @@
-.TH LIBIPERF 3 "June 2018" ESnet "User Manuals"
+.TH LIBIPERF 3 "December 2020" ESnet "User Manuals"
 .SH NAME
 libiperf \- API for iperf3 network throughput tester