Merge topic 'symlink-build-under-source'

d33b12d84b Add support for build tree symlink inside source tree
43416c48ed cmOutputConverter: Always set relative path top source and binary together
de766bc7e0 Xcode: Fix support for source tree symlink inside build tree
55db2cf1e5 Makefiles: Fix "make depend" with add_custom_command DEPFILE

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !7020