linux

rust: Fix warning_level=everything case #15369

Job	Run time
Arch Linux	16m 52s
Arch / PyPy	20m 54s
CUDA (on Arch)	6m 5s
Fedora	19m 48s
Gentoo	22m 26s
OpenSUSE	15m 26s
Ubuntu Bionic	14m 20s
Ubuntu Rolling (gcc, g++)	16m 33s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	11m 41s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	12m 3s
Ubuntu Rolling (clang, clang++)	19m 17s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	13m 51s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	11m 0s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	11m 42s
	3h 31m 58s

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