Fix bad import

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4051966

setuptools/command/bdist_wininst.py

 from distutils.command.bdist_wininst import bdist_wininst as _bdist_wininst
-import sys
+import os
 
 class bdist_wininst(_bdist_wininst):