Add import sys, needed by reference to sys.exc_info() in rmtree().
Discovered by Mitch Chapman.
diff --git a/Lib/shutil.py b/Lib/shutil.py
index b44a069..eb334f7 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -5,6 +5,7 @@
 """
 
 import os
+import sys
 import stat