linux

env.unset method #13910

Job	Run time
Arch Linux	28m 23s
CUDA (on Arch)	9m 16s
Arch / PyPy	31m 59s
Fedora	22m 52s
OpenSUSE	22m 31s
Ubuntu Rolling (gcc, g++)	24m 47s
Ubuntu Bionic	22m 23s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	16m 52s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	17m 15s
Ubuntu Rolling (clang, clang++)	28m 32s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	25m 35s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	18m 0s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	19m 43s
	4h 48m 8s

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