Bug 1236389 - Annotate intentional switch fallthroughs to suppress -Wimplicit-fallthrough warnings in mozapps/update. r=rstrong

toolkit/mozapps/update/updater/updater.cpp:3722:7 [-Wimplicit-fallthrough] unannotated fall-through between switch labels
toolkit/mozapps/update/updater/updater.cpp:3768:7 [-Wimplicit-fallthrough] unannotated fall-through between switch labels

toolkit/mozapps/update/updater/updater.cpp

@@ -3721,6 +3721,7 @@ int add_dir_entries(const NS_tchar *dirpath, ActionList *list)
         LOG(("add_dir_entries: found a non-standard file: " LOG_S,
              ftsdirEntry->fts_path));
         // Fall through and try to remove as a file
+        MOZ_FALLTHROUGH;
 
       // Files
       case FTS_F:
@@ -3767,7 +3768,7 @@ int add_dir_entries(const NS_tchar *dirpath, ActionList *list)
           rv = OK;
           break;
         }
-        // Fall through
+        MOZ_FALLTHROUGH;
 
       case FTS_ERR:
         rv = UNEXPECTED_FILE_OPERATION_ERROR;