linux

mtest: fix rebuilding correct target list before running tests #17110

Job	Run time
Arch / PyPy	20m 2s
Arch Linux	20m 5s
Ubuntu Rolling (gcc, g++)	20m 41s
CUDA (on Arch)	7m 46s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	14m 8s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 21s
Ubuntu Rolling (clang, clang++)	22m 29s
Fedora	17m 44s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 59s
Gentoo	22m 43s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	14m 39s
OpenSUSE	16m 2s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	14m 18s
Ubuntu Bionic	15m 9s
	3h 56m 6s

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