Feature: experimental meson buildsystem #1640

Job	Run time
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	2m 24s
build-mingw (windows-2022, ucrt64)	1m 45s
size-diff	50s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	1m 40s
build-mingw (windows-2022, clang64)	2m 24s
build-linux-meson (12.2.Rel1, 96b_carbon)	16s
build-linux-meson (12.2.Rel1, bluepill)	15s
build-linux-meson (12.2.Rel1, f072)	20s
build-linux-meson (12.2.Rel1, f3)	10s
build-linux-meson (12.2.Rel1, f4discovery)	14s
build-linux-meson (12.2.Rel1, hydrabus)	12s
build-linux-meson (12.2.Rel1, launchpad-icdi)	15s
build-linux-meson (12.2.Rel1, native)	10s
build-linux-meson (12.2.Rel1, stlink)	16s
build-linux-meson (12.2.Rel1, stlinkv3)	12s
build-linux-meson (12.2.Rel1, swlink)	15s
	11m 38s

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