fix minor testsuite change due to 4.02@15039

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15042 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#6502: spurious warning on "use_menhir" tag

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15043 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02