[gtk] cell area context: Use standard padding

[Matthias Clasen <matthiasc src gnome org>]

commit 7167113da9d0b738c1c063829b49b4bd53231017
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 26 22:40:02 2019 -0400

    cell area context: Use standard padding

 gtk/gtkcellareacontext.h | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)
---
diff --git a/gtk/gtkcellareacontext.h b/gtk/gtkcellareacontext.h
index c9f19c198c..b78b3bbb20 100644
--- a/gtk/gtkcellareacontext.h
+++ b/gtk/gtkcellareacontext.h
@@ -81,13 +81,8 @@ struct _GtkCellAreaContextClass
                                               gint               *natural_width);
 
   /*< private >*/
-  /* Padding for future expansion */
-  void (*_gtk_reserved1) (void);
-  void (*_gtk_reserved2) (void);
-  void (*_gtk_reserved3) (void);
-  void (*_gtk_reserved4) (void);
-  void (*_gtk_reserved5) (void);
-  void (*_gtk_reserved6) (void);
+
+  gpointer padding[8];
 };
 
 GDK_AVAILABLE_IN_ALL