Forgot to show attributes.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/extension_points@13510 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Keep item attributes on let-binding structure items.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/extension_points@13511 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02