patch applied (ghc-6.8/ghc): MERGED: fix race conditions in sandboxIO (#1583, #1922, #1946)

[Ian Lynagh]

Thu Dec  6 07:05:09 PST 2007  Ian Lynagh <igloo at earth.li>
  * MERGED: fix race conditions in sandboxIO (#1583, #1922, #1946)
  Simon Marlow <simonmar at microsoft.com>**20071204114444
   using the new block-inheriting forkIO (#1048)

    M ./compiler/main/InteractiveEval.hs -22 +25