linux

ExternalProgram: add cmd_array to complete the offering #17011

Job	Run time
Arch Linux	20m 15s
Arch / PyPy	20m 30s
CUDA (on Arch)	7m 30s
Ubuntu Rolling (gcc, g++)	20m 19s
Fedora	18m 36s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 46s
Gentoo	22m 20s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 9s
OpenSUSE	17m 15s
Ubuntu Rolling (clang, clang++)	22m 38s
Ubuntu Bionic	14m 51s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 37s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 57s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 42s
	3h 55m 25s

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