Meson

libnixf: add to top-level build #1742

Job	Run time
nix-build-develop-clang (none, release, true)	2m 50s
nix-build-develop-gcc (none, release, true)	3m 6s
nix-build-develop-clang (none, release, false)	2m 46s
nix-build-develop-gcc (none, release, false)	3m 11s
nix-build-develop-clang (none, debug, true)	2m 34s
nix-build-develop-gcc (none, debug, true)	3m 4s
nix-build-develop-clang (none, debug, false)	2m 35s
nix-build-develop-gcc (none, debug, false)	3m 3s
nix-build-develop-gcc (undefined, release, true)	6m 32s
nix-build-develop-gcc (undefined, release, false)	6m 31s
nix-build-develop-gcc (undefined, debug, true)	3m 34s
nix-build-develop-gcc (undefined, debug, false)	3m 35s
	43m 21s

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