Meson

libnixf: flatten into a single library #1930

Job	Run time
nix-build-develop-gcc (none, release, true)	3m 13s
nix-build-develop-clang (none, release, true)	2m 59s
nix-build-develop-gcc (none, release, false)	3m 18s
nix-build-develop-clang (none, release, false)	3m 7s
nix-build-develop-gcc (none, debug, true)	3m 5s
nix-build-develop-clang (none, debug, true)	2m 36s
nix-build-develop-gcc (none, debug, false)	3m 4s
nix-build-develop-clang (none, debug, false)	2m 41s
nix-build-develop-gcc (undefined, release, true)	6m 48s
nix-build-develop-gcc (undefined, release, false)	6m 58s
nix-build-develop-gcc (undefined, debug, true)	3m 41s
nix-build-develop-gcc (undefined, debug, false)	3m 43s
	45m 13s

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