Revert "remove fix-products-paths that is no longer required with recent ERP5."

This reverts commit a1c2e322.

stack/erp5/buildout.cfg

@@ -117,6 +117,9 @@ parts +=
   erp5
   genbt5list
 
+# fix products path (Zeo needs ERP5 Products to be available for
+# conflict resolution)
+  fix-products-paths
 # some additional utils
   zodbanalyze
 
@@ -390,6 +393,14 @@ repository = http://git.erp5.org/repos/erp5.git
 branch = master
 git-executable = ${git:location}/bin/git
 
+[fix-products-paths]
+recipe = plone.recipe.command
+stop-on-error = true
+dir = ${erp5:location}
+command =
+  rm -f "${:dir}/Products" && ln -s product "${:dir}/Products" && touch "${:dir}/product/__init__.py"
+update-command = ${:command}
+
 [testrunner]
 # XXX: Workaround for fact ERP5Type is not an distribution and does not
 #      expose entry point for test runner