add new port: ocaml-cryptokit 1.9

A library of cryptographic primitive -- block ciphers (AES, DES, 3DES),
stream ciphers (ARCfour), public-key crypto (RSA, DH), hashes (SHA-1,
SHA-256), MACs, random number generation -- all presented with a
compositional, extensible interface.
remove cryptokit, it's in the ports tree
add updated version from ocaml-cryptokit