remove needless part for python-2.7.

stack/erp5/buildout.cfg

@@ -426,7 +426,6 @@ eggs =
   Jinja2
   mechanize
   numpy
-  ordereddict
   paramiko
   ply
   pyflakes
@@ -577,9 +576,6 @@ python-memcached = 1.47-ipv6-1
 # use newest version of pytz
 pytz =
 
-# Patched version which support python 2.6
-PyXML = 0.8.4nxd001
-
 # we are still using this old stable version.
 rdiff-backup = 1.0.5