patch applied (haddock2): Fix installation in the GHC build system

[Ian Lynagh]

Wed Aug 18 11:57:24 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Fix installation in the GHC build system
  Data-files are now in subdirectories, so we need to handle that

    M ./ghc.mk -4 +4

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=haddock2;a=darcs_commitdiff;h=20100818185724-3fd76-ea2fccca45acf5c917b84b3d36e18d8e90649bbe.gz