patch applied (cabal-install): Use (\_ -> []) instead of mempty to avoid funky Monoid instance

[Duncan Coutts]

Wed Dec 10 14:31:06 PST 2008  Duncan Coutts <duncan at haskell.org>
  * Use (\_ -> []) instead of mempty to avoid funky Monoid instance
  This would let us build with ghc-6.4 or nhc if it were not for other issues.

    M ./Distribution/Client/Setup.hs -1 +1

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20081210223106-adfee-c293b17818c4168960118bc96854f33b848e8827.gz