Cleanup.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/raise_variants@14287 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
No need for caml_init_exceptions.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/raise_variants@14288 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02