Remove camlp4 dependency when building the core library

[hcarty]

It looks like camlp4 isn't required for the base msgpack library. Would you accept a PR reflecting this?

Is development active? Or has someone forked?

[vbmithr]

On 11/01/2017 16:17, orbifx wrote: Is development active? Or has someone forked?

I created vbmithr/ocaml-msgpck but it's not a fork, but a complete new project.

@vbmithr, I noticed that but it seemed to me this project was ahead; maybe it's not the case. How does your project compare to this one in terms of maturity?