[xmonad] darcs patch: Fix errors due to removal of catch in GHC7.6

1 patch for repository http://code.haskell.org/XMonadContrib: Sun Aug 26 17:12:14 PDT 2012 mgsloan@gmail.com * Fix errors due to removal of catch in GHC7.6 note is that this won't be necessary (but will generate warnings) once this GHC bug is fixed: http://hackage.haskell.org/trac/ghc/ticket/7167