Fix two NameErrors in distutils (#10407)
diff --git a/Lib/distutils/dir_util.py b/Lib/distutils/dir_util.py
index c7c9fcc..5b005f0 100644
--- a/Lib/distutils/dir_util.py
+++ b/Lib/distutils/dir_util.py
@@ -5,6 +5,7 @@
 __revision__ = "$Id$"
 
 import os, sys
+import errno
 from distutils.errors import DistutilsFileError, DistutilsInternalError
 from distutils import log