[gtk] menu shell: Use standard padding

[Matthias Clasen <matthiasc src gnome org>]

commit e57da008244f78c707774b7e28f2d2ec0c275dad
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 26 23:13:55 2019 -0400

    menu shell: Use standard padding

 gtk/gtkmenushell.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkmenushell.h b/gtk/gtkmenushell.h
index d98a1d09d5..58b635def0 100644
--- a/gtk/gtkmenushell.h
+++ b/gtk/gtkmenushell.h
@@ -76,11 +76,8 @@ struct _GtkMenuShellClass
   gboolean (*move_selected)    (GtkMenuShell *menu_shell,
                                 gint          distance);
 
-  /* Padding for future expansion */
-  void (*_gtk_reserved1) (void);
-  void (*_gtk_reserved2) (void);
-  void (*_gtk_reserved3) (void);
-  void (*_gtk_reserved4) (void);
+  /*< private >*/
+  gpointer padding[8];
 };