small fix

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14040 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
finish back pointing camlp4 changes from trunk to 4.01

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14041 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02