perf(core.wrapper): preferLocalBuild by default

https://nix.dev/manual/nix/2.33/protocols/json/derivation/options.html#preferLocalBuild

This prevents it from checking a remote cache for your wrapper
derivation with your settings in it.

Many wrapper derivation generators for various programs in nixpkgs and
external flakes set this in their derivation, as the derivation contains
user provided settings which will not be in a remote cache.

For the vast majority of wrapper derivations, the cost of checking the
network should far exceed the amount of time it takes to
link/copy/convert the files in the wrapper derivation.

If you have already built your wrapper derivation locally, it will still
check your local cache.

Author: BirdeeHub

lib/core.nix

@@ -916,6 +916,7 @@ in
             dontConfigure = true;
             dontPatch = true;
             dontFixup = true;
+            preferLocalBuild = true;
             name = package.name or "${package.pname or binName}-${version}";
             ${
               if builtins.isString (package.pname or binName) && package.pname or binName != "" then