updated for version 7.4.609

Problem:    For complicated list and dict use the garbage collector can run
            out of stack space.
Solution:   Use a stack of dicts and lists to be marked, thus making it
            iterative instead of recursive. (Ben Fritz)

src/if_python.c

@@ -1567,8 +1567,8 @@ Py_GetProgramName(void)
 }
 #endif /* Python 1.4 */
 
-    void
+    int
 set_ref_in_python (int copyID)
 {
-    set_ref_in_py(copyID);
+    return set_ref_in_py(copyID);
 }