Meson

nixd-next: switch to nixd-next #2280

Job	Run time
nix-build-develop-clang (none, release, true)	1m 32s
nix-build-develop-gcc (none, release, true)	1m 36s
nix-build-develop-clang (none, release, false)	1m 30s
nix-build-develop-gcc (none, release, false)	1m 37s
nix-build-develop-clang (none, debug, true)	1m 57s
nix-build-develop-gcc (none, debug, true)	1m 26s
nix-build-develop-clang (none, debug, false)	1m 26s
nix-build-develop-gcc (none, debug, false)	1m 27s
nix-build-develop-gcc (undefined, release, true)	2m 42s
nix-build-develop-gcc (undefined, release, false)	2m 40s
nix-build-develop-gcc (undefined, debug, true)	1m 39s
nix-build-develop-gcc (undefined, debug, false)	1m 41s
	21m 13s

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