fix test_py3kwarns

The fact that this was failing and went unnoticed so long seems like a good argument for being able to enable and disble py3kwarnings through Python.
diff --git a/Lib/plat-mac/FrameWork.py b/Lib/plat-mac/FrameWork.py
index 75588a6..69401dd 100644
--- a/Lib/plat-mac/FrameWork.py
+++ b/Lib/plat-mac/FrameWork.py
@@ -3,7 +3,7 @@
 DEBUG=0
 
 from warnings import warnpy3k
-warnpy3k("In 3.x, the FrameWork module is removed.")
+warnpy3k("In 3.x, the FrameWork module is removed.", stacklevel=2)
 
 import MacOS
 import traceback