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/development/libraries/kde-frameworks/khtml.nix

@@ -10,9 +10,10 @@ mkDerivation {
   name = "khtml";
   meta = { maintainers = [ lib.maintainers.ttuegel ]; };
   nativeBuildInputs = [ extra-cmake-modules perl ];
-  propagatedBuildInputs = [
-    giflib karchive kcodecs kglobalaccel ki18n kiconthemes kio kjs
-    knotifications kparts ktextwidgets kwallet kwidgetsaddons kwindowsystem
-    kxmlgui phonon qtx11extras sonnet
+  buildInputs = [
+    giflib karchive kcodecs kglobalaccel ki18n kiconthemes kio knotifications
+    kparts ktextwidgets kwallet kwidgetsaddons kwindowsystem kxmlgui phonon
+    qtx11extras sonnet
   ];
+  propagatedBuildInputs = [ kjs ];
 }