test: report timeout as failure #16796

Job	Run time
Arch / PyPy	20m 43s
Ubuntu Rolling (gcc, g++)	19m 28s
Arch Linux	19m 45s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 32s
CUDA (on Arch)	7m 38s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 11s
Fedora	20m 19s
Ubuntu Rolling (clang, clang++)	21m 25s
Gentoo	22m 24s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 7s
OpenSUSE	16m 25s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 29s
Ubuntu Bionic	15m 11s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 58s
	3h 53m 35s

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