linux

Add OS/2 support #17843

Job	Run time
Arch / PyPy	21m 17s
Arch Linux	19m 10s
CUDA (on Arch)	6m 16s
Ubuntu Rolling (gcc, g++)	20m 16s
Fedora	19m 16s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	14m 54s
Gentoo	22m 51s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	15m 18s
OpenSUSE	17m 24s
Ubuntu Rolling (clang, clang++)	24m 2s
Ubuntu Bionic	13m 37s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	17m 46s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 50s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	14m 33s
	4h 0m 30s

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