Remove some dead metadata rules.
Remove some dead metadata rules.

* gtk/Gtk.metadata: remove mismatched rules from prior release

sillsdev/gtk-sharp,akrisiun/gtk-sharp,openmedicus/gtk-sharp,orion75/gtk-sharp,antoniusriha/gtk-sharp,openmedicus/gtk-sharp,antoniusriha/gtk-sharp,akrisiun/gtk-sharp,Gankov/gtk-sharp,akrisiun/gtk-sharp,Gankov/gtk-sharp,akrisiun/gtk-sharp,Gankov/gtk-sharp,Gankov/gtk-sharp,antoniusriha/gtk-sharp,Gankov/gtk-sharp,orion75/gtk-sharp,orion75/gtk-sharp,antoniusriha/gtk-sharp,openmedicus/gtk-sharp,orion75/gtk-sharp,sillsdev/gtk-sharp,akrisiun/gtk-sharp,openmedicus/gtk-sharp,openmedicus/gtk-sharp,Gankov/gtk-sharp,orion75/gtk-sharp,sillsdev/gtk-sharp,openmedicus/gtk-sharp,antoniusriha/gtk-sharp,openmedicus/gtk-sharp,sillsdev/gtk-sharp,sillsdev/gtk-sharp