Feature: experimental meson buildsystem #1653

Job	Run time
size-diff	42s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	1m 39s
build-mingw (windows-2022, ucrt64)	4m 6s
build-linux-meson (12.2.Rel1, 96b_carbon)	15s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	1m 38s
build-mingw (windows-2022, clang64)	4m 46s
build-linux-meson (12.2.Rel1, bluepill)	12s
build-linux-meson (12.2.Rel1, f072)	16s
build-linux-meson (12.2.Rel1, f3)	16s
build-linux-meson (12.2.Rel1, f4discovery)	18s
build-linux-meson (12.2.Rel1, hydrabus)	15s
build-linux-meson (12.2.Rel1, launchpad-icdi)	12s
build-linux-meson (12.2.Rel1, native)	21s
build-linux-meson (12.2.Rel1, stlink)	12s
build-linux-meson (12.2.Rel1, stlinkv3)	11s
build-linux-meson (12.2.Rel1, swlink)	22s
	15m 41s

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