remove unused imports (closes #12432)

A patch from Vincent Legoll.
diff --git a/Lib/textwrap.py b/Lib/textwrap.py
index f4886a1..f014cb0 100644
--- a/Lib/textwrap.py
+++ b/Lib/textwrap.py
@@ -7,7 +7,7 @@
 
 __revision__ = "$Id$"
 
-import string, re
+import re
 
 __all__ = ['TextWrapper', 'wrap', 'fill', 'dedent']