Cleanup: iterator macros

- put render iterator in own scope
  (would shadow it's own variable if used multiple times).
- enforce semicolon at end of iterator macros.
- no need to typedef one-off macro structs.

source/blender/render/intern/source/pipeline.c

@@ -2043,7 +2043,7 @@ static void tag_dependend_objects_for_render(Scene *scene, int UNUSED(renderlay)
 			}
 		}
 	}
-	FOREACH_OBJECT_RENDERABLE_END
+	FOREACH_OBJECT_RENDERABLE_END;
 }
 #endif