* gtk/StatusIcon.custom: Use managed code to pass the address of
gtk_status_icon_position_menu to gtk_menu_popup.
svn path=/trunk/gtk-sharp/; revision=140939
* gtk/StatusIcon.custom : obsolete overload for backcompat on
GetGeometry, and custom PresentMenu method to invoke new glue.
* gtk/glue/statusicon.c : glue method to connect to gtk_menu_popup
without having to go across the native/managed boundary multiple
times using gtk_status_icon_position_menu wrapper.
[Fixes#79500]
svn path=/trunk/gtk-sharp/; revision=72236