Turn off Python pickle test for old style classes

Examples/test-suite/python/python_pickle_runme.py

@@ -1,12 +1,19 @@
 import python_pickle
 
 import pickle
+import sys
+
+def is_new_style_class(cls):
+    return hasattr(cls, "__class__")
 
 def check(p):
     msg = p.msg
     if msg != "hi there":
         raise RuntimeError("Bad, got: " + msg)
 
+if not is_new_style_class(python_pickle.PickleMe):
+    sys.exit(0)
+
 python_pickle.cvar.debug = False
 
 p = python_pickle.PickleMe("hi there")