Avoid deprecation warnings

The recent round of deprecation additions has caused some
warnings that we should avoid.

gtk/gtknotebook.c

@@ -2960,7 +2960,9 @@ show_drag_window (GtkNotebook        *notebook,
                                           &attributes,
                                           attributes_mask);
       gtk_widget_register_window (widget, priv->drag_window);
+G_GNUC_BEGIN_IGNORE_DEPRECATIONS
       gdk_window_set_background_rgba (priv->drag_window, &transparent);
+G_GNUC_END_IGNORE_DEPRECATIONS
     }
 
   gtk_widget_set_child_visible (page->tab_label, FALSE);