Meson

docs/README: update WIP note #2296

Job	Run time
nix-build-develop-clang (none, release, true)	1m 29s
nix-build-develop-gcc (none, release, true)	1m 37s
nix-build-develop-clang (none, release, false)	1m 30s
nix-build-develop-gcc (none, release, false)	1m 34s
nix-build-develop-clang (none, debug, true)	1m 26s
nix-build-develop-gcc (none, debug, true)	1m 26s
nix-build-develop-clang (none, debug, false)	1m 26s
nix-build-develop-gcc (none, debug, false)	1m 31s
nix-build-develop-gcc (undefined, release, true)	2m 44s
nix-build-develop-gcc (undefined, release, false)	2m 42s
nix-build-develop-gcc (undefined, debug, true)	1m 36s
nix-build-develop-gcc (undefined, debug, false)	1m 35s
	20m 36s

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