ab/cmake-nix-and-ci (was Re: What's cooking in git.git (Nov 2022, #07; Tue, 29))

> * ab/cmake-nix-and-ci (2022-11-04) 14 commits
>    (merged to 'next' on 2022-11-08 at 6ef4e93b36)
>   + CI: add a "linux-cmake-test" to run cmake & ctest on linux
>   + cmake: copy over git-p4.py for t983[56] perforce test
>   + cmake: only look for "sh" in "C:/Program Files" on Windows
>   + cmake: increase test timeout on Windows only
>   + cmake: support GIT_TEST_OPTS, abstract away WIN32 defaults
>   + Makefile + cmake: use environment, not GIT-BUILD-DIR
>   + test-lib.sh: support a "GIT_TEST_BUILD_DIR"
>   + cmake: set "USE_LIBPCRE2" in "GIT-BUILD-OPTIONS" for test-lib.sh
>   + cmake & test-lib.sh: add a $GIT_SOURCE_DIR variable
>   + cmake: chmod +x the bin-wrappers/* & SCRIPT_{SH,PERL} & git-p4
>   + cmake: don't copy chainlint.pl to build directory
>   + cmake: update instructions for portable CMakeLists.txt
>   + cmake: use "-S" and "-B" to specify source and build directories
>   + cmake: don't invoke msgfmt with --statistics
> 
>   Fix assorted issues with CTest on *nix machines.