kdeFrameworks: fixup inputs and outputs

- Reduce environment pollution with a separate $bin output containing programs,
  plugins, and shared data. Libraries remain in $out and are not installed into
  the environment.
- Only propagate build inputs as required.

pkgs/applications/kde/dolphin.nix

@@ -20,4 +20,5 @@ mkDerivation {
     kinit kio knewstuff knotifications kparts ktexteditor kwindowsystem
     phonon solid
   ];
+  outputs = [ "out" "dev" ];
 }