Meson

nixd: fix output of --version (#259) #1601

Job	Run time
nix-build-develop-clang (none, release, true)	4m 12s
nix-build-develop-clang (none, release, false)	4m 14s
nix-build-develop-gcc (none, release, true)	6m 30s
nix-build-develop-clang (none, debug, true)	5m 42s
nix-build-develop-gcc (none, release, false)	5m 46s
nix-build-develop-clang (none, debug, false)	4m 8s
nix-build-develop-gcc (none, debug, true)	5m 38s
nix-build-develop-gcc (none, debug, false)	6m 13s
nix-build-develop-gcc (undefined, release, true)	10m 29s
nix-build-develop-gcc (undefined, release, false)	14m 28s
nix-build-develop-gcc (undefined, debug, true)	6m 40s
nix-build-develop-gcc (undefined, debug, false)	5m 53s
	1h 19m 53s

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