Feature: experimental meson buildsystem #1768

Job	Run time
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 40s
build-mingw (windows-2022, ucrt64)	2m 36s
build-linux (focal, 96b_carbon	31s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 48s
build-mingw (windows-2022, clang64)	2m 27s
build-linux (focal, bluepill	34s
size-diff	48s
build-linux (focal, f072	26s
build-linux (focal, f3	26s
build-linux (focal, f4discovery	28s
build-linux (focal, hydrabus	31s
build-linux (focal, launchpad-icdi	31s
build-linux (focal, native	31s
build-linux (focal, stlink	25s
build-linux (focal, stlinkv3	27s
build-linux (focal, swlink	32s
	18m 41s

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