gtk/print.go
func (ps *PrintSettings) SetNumberUp(numberUp int) {
	C.gtk_print_settings_set_number_up(ps.native(), C.gint(numberUp))
}
func (ps *PrintSettings) SetNumberUp(numberUp int) {
	C.gtk_print_settings_set_number_up(ps.native(), C.gint(numberUp))
}
// SetNumberUp() is a wrapper around gtk_print_settings_set_number_up().