patch applied (cabal): Make the Compiler abstraction use the Program abstraction

[Duncan Coutts]

Wed Aug  1 13:54:28 PDT 2007  Duncan Coutts <duncan at haskell.org>
  * Make the Compiler abstraction use the Program abstraction
  So out with compilerPath :: FilePath, in with compilerProg :: Program
  Similarly for compilerPkgTool.
  Lots of knock-on changes due to this, including converting many more uses of
  rawSystemExit to rawSystemProgram.

    M ./Distribution/Compiler.hs -6 +15
    M ./Distribution/PreProcess.hs -4 +3
    M ./Distribution/Simple/Configure.hs -24 +40
    M ./Distribution/Simple/GHC.hs -8 +8
    M ./Distribution/Simple/Haddock.hs -3 +3
    M ./Distribution/Simple/Hugs.hs -4 +4
    M ./Distribution/Simple/JHC.hs -6 +6
    M ./Distribution/Simple/NHC.hs -2 +2
    M ./Distribution/Simple/Register.hs -9 +18