Refactor option getting v2 #17165

Job	Run time
Arch Linux	20m 20s
Arch / PyPy	20m 3s
CUDA (on Arch)	7m 21s
Fedora	18m 25s
Gentoo	22m 16s
Ubuntu Rolling (gcc, g++)	20m 14s
OpenSUSE	16m 23s
Ubuntu Bionic	47s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 26s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	13m 55s
Ubuntu Rolling (clang, clang++)	22m 14s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 8s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	14m 37s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 52s
	3h 39m 1s

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