patch applied (ghc-6.6/ghc): MERGED: more improvements for #1119

[Ian Lynagh]

Sun Apr  1 08:05:26 PDT 2007  Ian Lynagh <igloo at earth.li>
  * MERGED: more improvements for #1119
  Simon Marlow <simonmar at microsoft.com>**20070327153723
   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/InteractiveUI.hs -2 +10