linux

ci: fix Ubuntu Bionic job #17265

Job	Run time
Arch / PyPy	2m 11s
Arch Linux	2m 10s
Ubuntu Rolling (gcc, g++)	45s
CUDA (on Arch)	2m 11s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	1m 17s
Fedora	2m 11s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	1m 31s
Gentoo	2m 12s
Ubuntu Rolling (clang, clang++)	50s
OpenSUSE	2m 11s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	1m 12s
Ubuntu Bionic	47s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	1m 56s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	2m 0s
	23m 24s

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