patch applied (packages/Cabal): use -D__HADDOCK__ only when preprocessing for haddock < 2

[Ian Lynagh]

Sun Mar  1 17:51:37 PST 2009  Andrea Vezzosi <sanzhiyan at gmail.com>
  * use -D__HADDOCK__ only when preprocessing for haddock < 2
  Ignore-this: d186a5dbebe6d7fdc64e6414493c6271
  haddock-2.x doesn't define any additional macros.

    M ./Distribution/Simple/Haddock.hs -4 +7

View patch online:
http://darcs.haskell.org/packages/Cabal/_darcs/patches/20090302015137-cd449-2c7b00e8dc11160bae8fd242f279507e24683c48.gz