Feature: experimental meson buildsystem #1870

Job	Run time
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	5m 33s
build-mingw (windows-2022, ucrt64)	2m 56s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 37s
build-mingw (windows-2022, clang64)	2m 38s
size-diff	47s
build-linux (focal, 96b_carbon	38s
build-linux (focal, bluepill	32s
build-linux (focal, f072	32s
build-linux (focal, f3	33s
build-linux (focal, f4discovery	37s
build-linux (focal, hydrabus	38s
build-linux (focal, launchpad-icdi	33s
build-linux (focal, native	38s
build-linux (focal, stlink	33s
build-linux (focal, stlinkv3	31s
build-linux (focal, swlink	32s
	21m 48s

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