Feature: experimental meson buildsystem #1751

Job	Run time
size-diff	44s
build-mingw (windows-2022, ucrt64)	2m 34s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 40s
build-linux (focal, 96b_carbon	26s
build-mingw (windows-2022, clang64)	2m 28s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	4m 2s
build-linux (focal, bluepill	26s
build-linux (focal, f072	27s
build-linux (focal, f3	28s
build-linux (focal, f4discovery	32s
build-linux (focal, hydrabus	31s
build-linux (focal, launchpad-icdi	29s
build-linux (focal, native	27s
build-linux (focal, stlink	29s
build-linux (focal, stlinkv3	28s
build-linux (focal, swlink	32s
	18m 43s

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