Get rid of some uses of implicit removal of optional arguments.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14495 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Get rid of some uses of implicit removal of optional arguments.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14496 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02