Missing GTK images
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=1882
Reported by Martin Nilsson, IDA nilsson@pike.ida.liu.se
Some images referenced by the GTK refdoc is not created when make docs is ran:
gtk_aspectframe.png gtk_checkbutton.png gtk_databox.png gtk_menubar.png gtk_optionmenu.png gtk_radiobutton.png gnome_messagebox.png gnome_messagebox_2.png
gtk_button_3.png is generated, but is not checked in.