Add specific dependency handling for clang #17640

Job	Run time
Arch Linux	21m 29s
Arch / PyPy	22m 21s
CUDA (on Arch)	7m 23s
Fedora	20m 41s
Ubuntu Rolling (gcc, g++)	22m 34s
Gentoo	24m 50s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	15m 37s
OpenSUSE	15m 40s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	15m 59s
Ubuntu Bionic	15m 15s
Ubuntu Rolling (clang, clang++)	27m 17s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	18m 38s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	14m 20s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	14m 2s
	4h 16m 6s

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