Revert "Allow finalized_malloc to delay reclaiming disclaimed objects"

This functionality is deprecated in Alloy in favour of the buffered
finalization API.

This reverts commit 7767c87.

fnlz_mlc.c

@@ -55,14 +55,7 @@ STATIC int GC_CALLBACK GC_finalized_disclaim(void *obj)
         GC_ASSERT(!GC_find_leak);
         (*fc->proc)((word *)obj + 1, fc->cd);
     }
-#ifdef DISCLAIM_MARK_CHILDREN
-    /* Prevent the objects reachable from the disclaimed object from    */
-    /* being reclaimed immediately by marking them as live. Useful if   */
-    /* the disclaim function queues objects to be finalised later.      */
-    return 1;
-#else
     return 0;
-#endif
 }
 
 STATIC void GC_register_disclaim_proc_inner(unsigned kind,