patch applied (cabal): Define bracketOnError in compat; fixes the build for GHC 6.4

[Duncan Coutts]

Tue May 13 17:39:19 PDT 2008  Ian Lynagh <igloo at earth.li>
  UNDO: Define bracketOnError in compat; fixes the build for GHC 6.4

    R ./Distribution/Compat/Exception.hs
    M ./Distribution/Simple/Utils.hs -2 +1

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20080514003919-3fd76-e551f347810e5c9e25b5dd880ad7c27613a38910.gz