by TOOLBAR_TOP_WIDGET.
(xg_change_toolbar_position): Use widget returned by TOOLBAR_TOP_WIDGET.
Check toolbar_is_packed.
+ (xg_have_tear_offs, tearoff_remove, tearoff_activate): Condition on
+ HAVE_GTK_TEAROFF_MENU_ITEM_NEW.
+ (xg_have_tear_offs): When ! HAVE_GTK_TEAROFF_MENU_ITEM_NEW, return
+ false.
+ (create_menus): Create tearoff only if HAVE_GTK_TEAROFF_MENU_ITEM_NEW.
+ (xg_update_menubar): Update title only if
+ HAVE_GTK_TEAROFF_MENU_ITEM_NEW.
+ (xg_update_submenu): Skip tearoff only if
+ HAVE_GTK_TEAROFF_MENU_ITEM_NEW.
+ (xg_initialize): Initialize xg_detached_menus only if
+ HAVE_GTK_TEAROFF_MENU_ITEM_NEW.
* xterm.h (struct x_output): Surround handlebox_widget with
#ifdef HAVE_GTK_HANDLE_BOX_NEW. toolbar_is_packed is new,