linux

Add patches for cross-compilation #3

Job	Run time
Arch Linux	18m 46s
Arch / PyPy	18m 32s
CUDA (on Arch)	7m 0s
Fedora	18m 35s
Gentoo	18m 56s
Ubuntu Rolling (gcc, g++)	15m 25s
OpenSUSE	14m 24s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	10m 34s
Ubuntu Bionic	47s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	10m 39s
Ubuntu Rolling (clang, clang++)	18m 8s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	12m 52s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	11m 6s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	11m 16s
	3h 7m 0s

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