Fix a pixmap leak in the ms-windows engine
Fix a pixmap leak in the ms-windows engine

This was pointed out in https://bugzilla.gnome.org/show_bug.cgi?id=731967.

johne53/MB3Gtk-2,johne53/MB3Gtk-2,Distrotech/gtk,Distrotech/gtk,Distrotech/gtk,Distrotech/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Distrotech/gtk