Make ocaml-interp binary package lighter than it has never been before

Make ocaml-interp binary package lighter than it has never been before

In previuous versions of ocaml-interp, there was:
- Some cma files floating around (~ 2.3MB):
  + toplevellib.cma: Not used by the toplevel but rather by ocamlmktop which
    is in ocaml-nox
  + stdlib.cma and dynlink.cma: Not used by the toplevel
  We moved all theses cma files to ocaml-nox
- Some cmi/mli files (~ 300KB): We moved them to ocaml-base-nox, which is a
  dependency of ocaml-interp. Therefore, only the ocaml toplevel is kept in
  ocaml-interp.

This change allow dh_ocaml to compute automatically the dependencies more sainly
and without handling special cases for the compiler.