Refactor option getting v2 #16920

Job	Run time
Arch Linux	5m 21s
Arch / PyPy	5m 22s
CUDA (on Arch)	5m 21s
Ubuntu Rolling (gcc, g++)	1s
Fedora	4m 46s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	1s
Gentoo	4m 38s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	1s
OpenSUSE	3m 11s
Ubuntu Rolling (clang, clang++)	1s
Ubuntu Bionic	35s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	1s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	35s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	3m 10s
	33m 4s

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