patch applied (packages/process): Replace 20 lines of Setup.hs code with 2 lines of configuration in .cabal file

[Simon Marlow]

Thu Oct 18 04:07:24 PDT 2007  Duncan Coutts <duncan at haskell.org>
  * Replace 20 lines of Setup.hs code with 2 lines of configuration in .cabal file
  It's conditionaly building/exposing the System.Process module, only with ghc.
  It was being done previously in Setup.hs with an egregious hack.
  Conditionally exposing modules is pretty unpleasent, but at least it's now
  clear that's what it is doing.

    M ./Setup.hs -31 +1
    M ./process.cabal -1 +3