Do not duplicate find-links already present in stack/slapos.cfg .

stack/erp5/buildout.cfg

@@ -8,11 +8,9 @@ extensions =
   slapos.zcbworkarounds
   mr.developer
 
-find-links =
-    http://www.nexedi.org/static/packages/source/slapos.buildout/
+find-links +=
     http://www.nexedi.org/static/packages/source/hexagonit.recipe.download/
     http://dist.repoze.org
-    http://www.nexedi.org/static/packages/source/
     http://www.owlfish.com/software/wsgiutils/download.html
 
 extends =