* gtk/Gtk.metadata:
* glade/Glade.metadata: mark return type as const-gchar* for
Gtk.Global.CheckVersion and Glade.Global.ModuleCheckVersion
so Gtk# does not try to free them. Thanks to
jaspervp@gmx.net (Jasper van Putten) for identifying the Glade
part. Fixes bugs #61329 and #60954
svn path=/trunk/gtk-sharp/; revision=31239