linux

Revert msys2 python shutil workarounds #17132

Job	Run time
Arch Linux	20m 13s
CUDA (on Arch)	7m 15s
Arch / PyPy	19m 56s
Fedora	17m 31s
Ubuntu Rolling (gcc, g++)	19m 37s
Gentoo	21m 59s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 50s
OpenSUSE	16m 7s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 4s
Ubuntu Bionic	14m 40s
Ubuntu Rolling (clang, clang++)	22m 5s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 30s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	12m 40s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 19s
	3h 48m 46s

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