2.91.5.1:

2010-12-02  Murray Cumming  <murrayc@murrayc-desktop>

	Temporarily remove methods that use GTK+ function not in GTK+ 2.91.5.

	* gtk/src/combobox.hg: Some new functions were added after the 
	GTK+ 2.91.5 release, so this allows gtkmm 2.91.5.1 to build with 
	GTK+ 2.91.5.