linux

external_project: workaround for MinGW #16984

Job	Run time
Arch Linux	20m 12s
Arch / PyPy	20m 0s
CUDA (on Arch)	7m 7s
Ubuntu Rolling (gcc, g++)	19m 34s
Fedora	17m 50s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 37s
Gentoo	21m 53s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 2s
OpenSUSE	16m 20s
Ubuntu Rolling (clang, clang++)	22m 2s
Ubuntu Bionic	14m 56s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 8s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 54s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 32s
	3h 50m 7s

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