linux

Speedup extract_objects #17606

Job	Run time
Arch Linux	21m 8s
CUDA (on Arch)	7m 15s
Fedora	19m 39s
Gentoo	24m 33s
OpenSUSE	15m 42s
Ubuntu Bionic	14m 57s
Arch / PyPy	21m 35s
Ubuntu Rolling (gcc, g++)	20m 56s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	15m 35s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	15m 24s
Ubuntu Rolling (clang, clang++)	25m 7s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	17m 44s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 29s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 34s
	4h 6m 38s

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