readd lxml-python.cfg that is removed mistakenly in r42936.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42953 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/software-profiles/erp5.cfg

@@ -2,6 +2,7 @@
 extends =
   mysql-tritonn-5.0.cfg
   python-2.4.cfg
+  lxml-python.cfg
   pyxml-python.cfg
   mysql-python.cfg
   subversion.cfg