Remove a bunch of dead code

Code isn't version control. We don't need bug links and commented out
code to remind us of how things were done originally.

https://bugzilla.gnome.org/show_bug.cgi?id=671104

src/core/stack.c

@@ -602,16 +602,7 @@ create_constraints (Constraint **constraints,
                   continue;
                 }
               
-#if 0
-              /* old way of doing it */
-              if (!(meta_window_is_ancestor_of_transient (w, group_window)) &&
-                  !WINDOW_TRANSIENT_FOR_WHOLE_GROUP (group_window))  /* note */;/*note*/
-#else
-              /* better way I think, so transient-for-group are constrained
-               * only above non-transient-type windows in their group
-               */
               if (!WINDOW_HAS_TRANSIENT_TYPE (group_window))
-#endif
                 {
                   meta_topic (META_DEBUG_STACK, "Constraining %s above %s as it's transient for its group\n",
                               w->desc, group_window->desc);