Manually copy patch for bug 7250 from the release26-maint branch. I suck

because I did this in the wrong order and couldn't smack svnmerge into
submission.

Lib/wsgiref/handlers.py

@@ -434,6 +434,10 @@ class CGIHandler(BaseCGIHandler):
     """
 
     wsgi_run_once = True
+    # Do not allow os.environ to leak between requests in Google App Engine
+    # and other multi-run CGI use cases.  This is not easily testable.
+    # See http://bugs.python.org/issue7250
+    os_environ = {}
 
     def __init__(self):
         BaseCGIHandler.__init__(