Feature: experimental meson buildsystem #1736

Job	Run time
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 39s
build-mingw (windows-2022, ucrt64)	2m 41s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 41s
size-diff	48s
build-mingw (windows-2022, clang64)	2m 32s
build-linux (focal, 96b_carbon, rtt true)	34s
build-linux (focal, bluepill, rtt false)	33s
build-linux (focal, f072, rtt false)	28s
build-linux (focal, f3, rtt true)	31s
build-linux (focal, f4discovery, rtt true)	33s
build-linux (focal, hydrabus, rtt true)	29s
build-linux (focal, launchpad-icdi, rtt true)	27s
build-linux (focal, native, rtt false)	32s
build-linux (focal, stlink, rtt false)	26s
build-linux (focal, stlinkv3, rtt true)	26s
build-linux (focal, swlink, rtt false)	26s
	18m 46s

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