patch applied (cabal): Use Setup.hs like everyone else does

[Duncan Coutts]

Thu Jan 31 03:59:53 PST 2008  Duncan Coutts <duncan at haskell.org>
  * Use Setup.hs like everyone else does
  and note the issue about custom vs simple build-type for Cabal itself.

     ./Setup.lhs -> ./Setup.hs
    M ./DefaultSetup.hs -1
    M ./Makefile -1 +1
    M ./Setup.hs -7 +9