ERP5: fix support for NEO

Maybe we should use 'parts +=' everywhere in /components/*/buildout.cfg

stack/erp5/buildout.cfg

@@ -52,8 +52,9 @@ extends =
   ../../component/6tunnel/buildout.cfg
   ../../component/findutils/buildout.cfg
   ../../component/userhosts/buildout.cfg
-  ../../software/neoppod/software-common.cfg
   ../../component/postfix/buildout.cfg
+  ../../software/neoppod/software-common.cfg
+# keep neoppod extends last
 
 parts +=
   erp5-util-develop