patch applied (cabal): Use our own GetOpt if __GLASGOW_HASKELL__ >= 606 only

[Ian Lynagh]

Tue Jul 24 14:31:12 PDT 2007  Ian Lynagh <igloo at earth.li>
  * Use our own GetOpt if __GLASGOW_HASKELL__ >= 606 only
  Used to be if __GLASGOW_HASKELL__ >= 604, but the 6.4 branch had a bug
  which looks likely to be the cause of GHC build failures we're seeing:
  -         procNextOpt (NonOpt x)   RequireOrder      = ([],x:rest,us,[])
  +         procNextOpt (NonOpt x)   RequireOrder      = ([],x:rest,[],[])

    M ./Distribution/GetOpt.hs -1 +1