linux

De-duplicate argument validation in the build module #17831

Job	Run time
Arch / PyPy	21m 16s
Ubuntu Rolling (gcc, g++)	21m 30s
Arch Linux	20m 37s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	15m 40s
CUDA (on Arch)	7m 0s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	16m 11s
Ubuntu Rolling (clang, clang++)	24m 58s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	18m 3s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 49s
Fedora	20m 3s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	14m 1s
Gentoo	25m 1s
OpenSUSE	18m 35s
Ubuntu Bionic	14m 50s
	4h 11m 34s

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