baselib: be compatible with ocamlnet 2 and 3.
baselib: be compatible with ocamlnet 2 and 3.

Ignore-this: 9de684a97e3e3fa5052ad99d220a91e

darcs-hash:20110125002846-da4f2-0fad9af0d7db0f2fd00af30a16102718d4c590c1

mfp/ocsigenserver,mfp/ocsigenserver