Feature: experimental meson buildsystem #1815

Job	Run time
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 36s
build-linux (focal, 96b_carbon	33s
size-diff	44s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 37s
build-mingw (windows-2022, ucrt64)	2m 44s
build-linux (focal, bluepill	40s
build-mingw (windows-2022, clang64)	2m 31s
build-linux (focal, f072	37s
build-linux (focal, f3	35s
build-linux (focal, f4discovery	53s
build-linux (focal, hydrabus	33s
build-linux (focal, launchpad-icdi	35s
build-linux (focal, native	38s
build-linux (focal, stlink	33s
build-linux (focal, stlinkv3	52s
build-linux (focal, swlink	32s
	20m 13s

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