patch applied (packages/Cabal): No more need for the distinction between null and emptyBuildInfo

[Ian Lynagh]

Fri Jun 13 17:16:54 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * No more need for the distinction between null and emptyBuildInfo
  Now that we have removed the hsSourceDirs = [currentDir] default
  from emptyBuildInfo it is now equal to nullBuildInfo.

    M ./Distribution/PackageDescription.hs -15 +5

View patch online:
http://darcs.haskell.org/packages/Cabal/_darcs/patches/20080614001654-adfee-6b68303da149de766728770b4a473ab085e8746f.gz