toolchain.py minimum CMake 3.10 to avoid deprecation warning #16754

Job	Run time
Arch Linux	20m 37s
Arch / PyPy	20m 27s
CUDA (on Arch)	8m 2s
Ubuntu Rolling (gcc, g++)	20m 7s
Fedora	20m 1s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	14m 14s
Gentoo	22m 46s
OpenSUSE	17m 4s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 11s
Ubuntu Rolling (clang, clang++)	22m 37s
Ubuntu Bionic	15m 20s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 19s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	14m 13s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 55s
	3h 58m 53s

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