patch applied (packages/Cabal): When looking for already pre-processed source files, check the build directory

[Ian Lynagh]

Thu Aug 19 17:17:55 PDT 2010  Ian Lynagh <igloo at earth.li>
  * When looking for already pre-processed source files, check the build directory
  Fixes hscolour'ing Config.hs in GHC

    M ./Distribution/Simple/PreProcess.hs -1 +1

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/Cabal;a=darcs_commitdiff;h=20100820001755-3fd76-29b685891ccb0e037186558e41a40e2c103e53e1.gz