Feature: experimental meson buildsystem #1767

Job	Run time
build-mingw (windows-2022, ucrt64)	5m 8s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 36s
build-mingw (windows-2022, clang64)	4m 52s
build-linux (focal, 96b_carbon	31s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 40s
build-linux (focal, bluepill	27s
build-linux (focal, f072	37s
size-diff	48s
build-linux (focal, f3	30s
build-linux (focal, f4discovery	33s
build-linux (focal, hydrabus	27s
build-linux (focal, launchpad-icdi	26s
build-linux (focal, native	26s
build-linux (focal, stlink	24s
build-linux (focal, stlinkv3	27s
build-linux (focal, swlink	31s
	23m 23s

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