* gtk/gtkenums.h: Deprecate GtkPreviewType,
        GtkSignalRunType, GtkSideType, GtkSubmenuPlacement, GtkSubmenuDirection
        (#68183, Matthias Clasen)

        * gtk/gtkmenuitem.h: Remove _gtk_menu_item_set_placement() from
        the public header to avoid having to use GtkSubmenuPlacement.

        * gtk/{gtkmenuitem.c,gtkmenubar.c,gtkmenushell.c}: #define
        GTK_MENU_INTERNALS to preserve access to GtkSubmenu*.

        * gdk/gdki18n.h: Deprecate contents. (Darin Adler.)