* extconf.rb: added Ruby/GTK+ dependency for   gdk_region_get_type(). Thanks to Yaakov Selkowitz.
* extconf.rb: added Ruby/GTK+ dependency for
  gdk_region_get_type(). Thanks to Yaakov Selkowitz.


kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2