Use proper tools when we want to do powerful things.

  * exit perl the dumbass. Have a bindings ocaml(lex) generator. Distributed
    tarballs will contain the generated files so that having ocaml is not
    absolutely required.

  * for now on, guess how to compile it...
    (hint: ocamllex cpkg2c.mll; ocamlopt -o cpkg2c str.cmxa cpkg2c.ml)

There has been many improvements wrt the old perl thing, so it won't work on
current cpkg files yet.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>