patch applied (ghc): Use System.IO.stderr rather than IO.stderr in GHCi. Fixes trac #1001.

[Ian Lynagh]

Sat Dec  9 10:51:52 PST 2006  Ian Lynagh <igloo at earth.li>
  * Use System.IO.stderr rather than IO.stderr in GHCi. Fixes trac #1001.
  GHCi evaluates a command to flush the stdout/stderr buffers, but this
  command can only use names that are in scope. It used to need IO.stderr
  from the haskell98 package, but this patch means it only needs things
  from the base package.

    M ./compiler/ghci/InteractiveUI.hs -1 +1