patch applied (cabal): More -Wall clean fixes

[Ian Lynagh]

Wed Jan 10 05:58:38 PST 2007  Ian Lynagh <igloo at earth.li>
  * More -Wall clean fixes

    M ./Distribution/PackageDescription.hs -2 +8
    M ./Distribution/PreProcess.hs -3 +4
    M ./Distribution/Simple/Build.hs -1 +1
    M ./Distribution/Simple/Configure.hs -3 +7
    M ./Distribution/Simple/GHC.hs -20 +22
    M ./Distribution/Simple/Hugs.hs -10 +6
    M ./Distribution/Simple/Install.hs -3
    M ./Distribution/Simple/Register.hs -9 +9