Feature: experimental meson buildsystem #1813

Job	Run time
build-mingw (windows-2022, ucrt64)	2m 44s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 44s
build-mingw (windows-2022, clang64)	2m 33s
build-linux (focal, 96b_carbon	1m 13s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 29s
build-linux (focal, bluepill	37s
size-diff	45s
build-linux (focal, f072	49s
build-linux (focal, f3	39s
build-linux (focal, f4discovery	41s
build-linux (focal, hydrabus	39s
build-linux (focal, launchpad-icdi	46s
build-linux (focal, native	40s
build-linux (focal, stlink	37s
build-linux (focal, stlinkv3	38s
build-linux (focal, swlink	39s
	21m 13s

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