[gtk] cell renderer: Use standard padding

[Matthias Clasen <matthiasc src gnome org>]

commit b835367413a9602282e4de2acdc527c6c3561402
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 26 23:35:24 2019 +0000

    cell renderer: Use standard padding

 gtk/gtkcellrenderer.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/gtk/gtkcellrenderer.h b/gtk/gtkcellrenderer.h
index c5d8c55a91..815aef265f 100644
--- a/gtk/gtkcellrenderer.h
+++ b/gtk/gtkcellrenderer.h
@@ -176,10 +176,7 @@ struct _GtkCellRendererClass
 
   GtkCellRendererClassPrivate *priv;
 
-  /* Padding for future expansion */
-  void (*_gtk_reserved2) (void);
-  void (*_gtk_reserved3) (void);
-  void (*_gtk_reserved4) (void);
+  gpointer padding[8];
 };
 
 GDK_AVAILABLE_IN_ALL