patch applied (packages/base): Don' t use Fd/FD in foreign decls

[Ian Lynagh]

Wed Apr  4 08:58:22 PDT 2007  Ian Lynagh <igloo at earth.li>
  * Don't use Fd/FD in foreign decls
  Using CInt makes it much easier to verify that it is right, and we won't
  get caught out by possible newtype switches between CInt/Int.

    M ./GHC/Conc.lhs -4 +16
    M ./GHC/Handle.hs -6 +6