qt5: move kdeDerivation to qt5.mkDerivation

pkgs/desktops/plasma-5/default.nix

@@ -25,7 +25,7 @@ existing packages here and modify it as necessary.
 */
 
 {
-  libsForQt5, kdeDerivation, lib, fetchurl,
+  libsForQt5, lib, fetchurl,
   gconf,
   debug ? false,
 }:
@@ -35,7 +35,8 @@ let
     let
       callPackage = self.newScope {
         plasmaPackage = import ./build-support/package.nix {
-          inherit kdeDerivation lib fetchurl;
+          inherit lib fetchurl;
+          mkDerivation = libsForQt5.callPackage ({ mkDerivation }: mkDerivation) {};
         };
       };
     in {