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nixos/man-db: set `preferLocalBuild = true`
When we _must_ build, prefer building locally since we probably already have the manpages here. Otherwise, Nix would send all the manpages to a remote builder which isn't likely to be much faster since building the DB is single-threaded. Hopefully a best-of-both worlds between keeping or removing https://github.com/NixOS/nixpkgs/commit/39e63f110e2b8607e4142e1461d08fb20b36497e.