Correct missing import in ssl_support

(grafted from 3b91f246d8de2f54b4b764dfe362a3677a001162)

--HG--
branch : setuptools-0.6
extra : source : 3b91f246d8de2f54b4b764dfe362a3677a001162

setuptools/ssl_support.py

-import sys, os, socket, urllib2, atexit, re
-from pkg_resources import ResolutionError, ExtractionError
+import sys, os, socket, urllib2, atexit
+from pkg_resources import ResolutionError, ExtractionError, resource_filename
 
 try:
     import ssl
@@ -236,7 +236,7 @@ def find_ca_bundle():
             if os.path.isfile(cert_path):
                 return cert_path
     try:
-        return pkg_resources.resource_filename('certifi', 'cacert.pem')
+        return resource_filename('certifi', 'cacert.pem')
     except (ImportError, ResolutionError, ExtractionError):
         return None