patch applied (cabal): Do not delete platform independent pre-processed sources during sdist

[Duncan Coutts]

Tue May  1 07:24:19 PDT 2007  Duncan Coutts <duncan.coutts at worc.ox.ac.uk>
  * Do not delete platform independent pre-processed sources during sdist
  Since only platform independent pre-processed sources are now left in the
  src dirs we don't have to delete any pre-processed sources and can just
  inlcude them all into the src tarball.
  Ideally we'd track this slightly better in future, it's not nice to be keeping
  any generates sources in the src dirs, they should be considered read-only.

    M ./Distribution/Simple/SrcDist.hs -2 +1