linux

external_project: workaround for MinGW #16986

Job	Run time
Ubuntu Rolling (gcc, g++)	19m 46s
Arch Linux	20m 3s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 27s
Arch / PyPy	20m 3s
CUDA (on Arch)	7m 21s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 9s
Fedora	17m 37s
Ubuntu Rolling (clang, clang++)	21m 56s
Gentoo	21m 50s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 27s
OpenSUSE	16m 22s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	14m 24s
Ubuntu Bionic	14m 43s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	14m 6s
	3h 51m 14s

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