Feature: experimental meson buildsystem #1750

Job	Run time
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 34s
build-mingw (windows-2022, ucrt64)	4m 57s
build-linux (focal, 96b_carbon	39s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	4m 10s
size-diff	43s
build-mingw (windows-2022, clang64)	5m 3s
build-linux (focal, bluepill	35s
build-linux (focal, f072	25s
build-linux (focal, f3	30s
build-linux (focal, f4discovery	28s
build-linux (focal, hydrabus	32s
build-linux (focal, launchpad-icdi	29s
build-linux (focal, native	27s
build-linux (focal, stlink	29s
build-linux (focal, stlinkv3	32s
build-linux (focal, swlink	31s
	24m 4s

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