patch applied (ghc): Remove uses of Data.Traversable to fix stage1 on pre ghc-6.6 systems

[Pepe Iborra]

Mon Dec 18 01:53:43 PST 2006  Pepe Iborra <mnislaih at gmail.com>
  * Remove uses of Data.Traversable to fix stage1 on pre ghc-6.6 systems

    M ./compiler/ghci/Debugger.hs -3 +3
    M ./compiler/ghci/RtClosureInspect.hs -4 +2
    M ./compiler/main/GHC.hs -1
    M ./compiler/utils/Maybes.lhs -1 +6