Compilation issues with ocaml 4.01(beta1)

Hi,

ocamlnet is unable to compile with ocamlnet 4.01(beta1) due to some
changes (especially O_CLOEXEC added in Unix.open_flag).

Some fixes are available here:
https://github.com/OCamlPro/opam-repository/commit/7dca72113f57cbfa74f698de969ed38acdcc6f69

For the rest (O_CLOEXEC) more recently added, it need the same changes
than for O_SHARE_DELETE
(https://godirepo.camlcity.org/wwwsvn?rev=1790&root=lib-ocamlnet2&view=rev).

I hope it will be fixed and released soon, and thanks in advance,

Cheers,

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