Added st_update_framebuffer struct/object.

src/mesa/state_tracker/st_atom.c

@@ -42,6 +42,7 @@
  */
 static const struct st_tracked_state *atoms[] =
 {
+   &st_update_framebuffer,
    &st_update_cbuf,
    &st_update_clip,
    &st_update_fs,

src/mesa/state_tracker/st_atom.h

@@ -44,6 +44,7 @@ void st_destroy_atoms( struct st_context *st );
 void st_validate_state( struct st_context *st );
 
 
+const struct st_tracked_state st_update_framebuffer;
 const struct st_tracked_state st_update_cbuf;
 const struct st_tracked_state st_update_clip;
 const struct st_tracked_state st_update_depth;