Meson

nixd/tools/nixd-attrset-eval: support completion for "builtins" #3250

Job	Run time
nix-build-develop-clang (none, release, true)	2m 53s
nix-build-develop-gcc (none, release, true)	3m 14s
nix-build-develop-clang (none, release, false)	2m 57s
nix-build-develop-gcc (none, release, false)	3m 8s
nix-build-develop-clang (none, debug, true)	2m 40s
nix-build-develop-gcc (none, debug, true)	2m 53s
nix-build-develop-clang (none, debug, false)	2m 50s
nix-build-develop-gcc (none, debug, false)	2m 56s
nix-build-develop-gcc (address, release, true)	4m 33s
nix-build-develop-gcc (address, release, false)	4m 44s
nix-build-develop-gcc (address, debug, true)	4m 3s
nix-build-develop-gcc (address, debug, false)	3m 59s
nix-build-develop-gcc (undefined, release, true)	4m 6s
nix-build-develop-gcc (undefined, release, false)	4m 16s
nix-build-develop-gcc (undefined, debug, true)	3m 16s
nix-build-develop-gcc (undefined, debug, false)	3m 20s
	55m 48s

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