patch applied (ghc): more improvements for #1119

[Simon Marlow]

Tue Mar 27 08:37:23 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * more improvements for #1119
  When GHCi compiles its code framgents for setting buffering, it wants
  to refer to base:System.IO rather than whatever System.IO is on the
  search path, unfortunately there's no way to do this in source code,
  so to hack around it we set the search path to empty before compiling
  these expressions (not forgetting to flush the finder cache
  afterward).

    M ./compiler/ghci/GhciMonad.hs -2 +11