Update to 2.5.0.0
pkgsrc changes: static -> dynamic
Changes from https://github.com/haskell/network
2.5.0.0
 - Merge pull request #123 from shockkolate/master
   Network.Socket: Added CustomSockOpt data constructor for SocketOption
2.4.2.3
 - Bring latest GNU config in.
Remove hs-data-default, hs-extensible-exceptions, imported to pkgsrc/devel.