patch applied (cabal): Assuming ghc-6.4 or nhc-1.20 as a minimum allows us to remove much cpp cruft

[Duncan Coutts]

Wed Jan 23 11:22:58 PST 2008  Duncan Coutts <duncan at haskell.org>
  * Assuming ghc-6.4 or nhc-1.20 as a minimum allows us to remove much cpp cruft

    M ./Distribution/Configuration.hs -11
    M ./Distribution/Simple/Configure.hs -8
    M ./Distribution/Simple/GHC.hs -14 +7
    M ./Distribution/Simple/Hugs.hs -4
    M ./Distribution/Simple/Install.hs -8
    M ./Distribution/Simple/NHC.hs -8 +2
    M ./Distribution/Simple/Register.hs -8
    M ./Distribution/Simple/SrcDist.hs -7
    M ./Distribution/Simple/Utils.hs -11 +3
    M ./Distribution/Version.hs -112 +3