kipi_plugins: mark as broken; should come from digikam

pkgs/applications/graphics/kipi-plugins/default.nix

···
     homepage = http://www.kipi-plugins.org;
     inherit (kdelibs.meta) platforms;
     maintainers = with stdenv.lib.maintainers; [ viric urkud ];
+    broken = true; # it should be build from digikam sources, perhaps together
   };
 }