hotfix(magic-wormhole): fix darwin build

nix/overlays/nixpkgs.nix

@@ -2,9 +2,24 @@
 
 final: prev:
 
+let
+  inherit (prev) darwin;
+
+  python3 = prev.python3.override {
+    packageOverrides = final: prev: {
+      # FIXME: works around the following error
+      # > FileNotFoundError: [Errno 2] No such file or directory: 'locale'
+      magic-wormhole = prev.magic-wormhole.overridePythonAttrs (old: {
+        nativeCheckInputs = (old.nativeCheckInputs or [ ]) ++ [ darwin.locale ];
+      });
+    };
+  };
+in
 {
   # TODO: remove
   # https://github.com/NixOS/nixpkgs/pull/263951
   cutter = prev.cutter.override { python3 = prev.python310; };
 
+} // prev.lib.optionalAttrs prev.stdenv.isDarwin {
+  magic-wormhole = with python3.pkgs; toPythonApplication magic-wormhole;
 }