Meson

libnixf: fixup diagnostic message #3175

Job	Run time
nix-build-develop-clang (none, release, true)	2m 57s
nix-build-develop-gcc (none, release, true)	3m 12s
nix-build-develop-clang (none, release, false)	3m 9s
nix-build-develop-gcc (none, release, false)	3m 16s
nix-build-develop-clang (none, debug, true)	2m 52s
nix-build-develop-gcc (none, debug, true)	3m 1s
nix-build-develop-clang (none, debug, false)	2m 46s
nix-build-develop-gcc (none, debug, false)	3m 5s
nix-build-develop-gcc (address, release, true)	4m 40s
nix-build-develop-gcc (address, release, false)	4m 42s
nix-build-develop-gcc (address, debug, true)	4m 5s
nix-build-develop-gcc (address, debug, false)	4m 11s
nix-build-develop-gcc (undefined, release, true)	4m 15s
nix-build-develop-gcc (undefined, release, false)	4m 17s
nix-build-develop-gcc (undefined, debug, true)	3m 23s
nix-build-develop-gcc (undefined, debug, false)	3m 25s
	57m 16s

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