[Gtk] Add dllmap to libgdk.
[Gtk] Add dllmap to libgdk.

New custom function added in gtk to free gdk_events is not avaialble
due to probing not being able to find libgdk

sillsdev/gtk-sharp,sillsdev/gtk-sharp,sillsdev/gtk-sharp,sillsdev/gtk-sharp,sillsdev/gtk-sharp