Add CWD option to subprocess_create_ex #129

Job	Run time
build (ubuntu-latest, Debug, clang)	10s
build (ubuntu-latest, Debug, gcc)	25s
build (ubuntu-latest, Debug, tcc)	20s
build (ubuntu-latest, RelWithDebInfo, clang)	10s
build (ubuntu-latest, RelWithDebInfo, gcc)	12s
build (ubuntu-latest, RelWithDebInfo, tcc)	13s
build (ubuntu-latest, MinSizeRel, clang)	9s
build (ubuntu-latest, MinSizeRel, gcc)	24s
build (ubuntu-latest, MinSizeRel, tcc)	13s
build (ubuntu-latest, Release, clang)	16s
build (ubuntu-latest, Release, gcc)	26s
build (ubuntu-latest, Release, tcc)	23s
build (windows-latest, Debug, default)	12s
build (windows-latest, Debug, clang)	13s
build (windows-latest, RelWithDebInfo, default)	1s
build (windows-latest, RelWithDebInfo, clang)	1s
build (windows-latest, MinSizeRel, default)	1s
build (windows-latest, MinSizeRel, clang)	13s
build (windows-latest, Release, default)	1s
build (windows-latest, Release, clang)	1s
build (macos-11, Debug, default)	13s
build (macos-11, RelWithDebInfo, default)	12s
build (macos-11, MinSizeRel, default)	15s
build (macos-11, Release, default)	17s
build (macos-14, Debug, default)	1s
build (macos-14, RelWithDebInfo, default)	1s
build (macos-14, MinSizeRel, default)	9s
build (macos-14, Release, default)	1s
	5m 13s

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