Meson

libnixf: support multiple fixes #1970

Job	Run time
nix-build-develop-clang (none, release, true)	3m 0s
nix-build-develop-gcc (none, release, true)	3m 28s
nix-build-develop-clang (none, release, false)	2m 57s
nix-build-develop-gcc (none, release, false)	3m 21s
nix-build-develop-clang (none, debug, true)	2m 43s
nix-build-develop-gcc (none, debug, true)	3m 9s
nix-build-develop-clang (none, debug, false)	2m 44s
nix-build-develop-gcc (none, debug, false)	3m 9s
nix-build-develop-gcc (undefined, release, true)	6m 50s
nix-build-develop-gcc (undefined, release, false)	7m 0s
nix-build-develop-gcc (undefined, debug, true)	3m 43s
nix-build-develop-gcc (undefined, debug, false)	3m 45s
	45m 49s

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