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/bgenlocations.py b/Lib/plat-mac/bgenlocations.py
index 7643e4b..38f4159 100644
--- a/Lib/plat-mac/bgenlocations.py
+++ b/Lib/plat-mac/bgenlocations.py
@@ -8,7 +8,7 @@
import os
from warnings import warnpy3k
-warnpy3k("In 3.x, the bgenlocations module is removed.")
+warnpy3k("In 3.x, the bgenlocations module is removed.", stacklevel=2)
Error = "bgenlocations.Error"
#