patch applied (packages/Cabal): Fix finding ghc's ld.exe on windows.

[Simon Marlow]

Tue Nov 20 02:11:10 PST 2007  Duncan Coutts <duncan at haskell.org>
  * Fix finding ghc's ld.exe on windows.
  It looks like it had worked but the ld -x test broke that too. Grr.

    M ./Distribution/Simple/GHC.hs -9 +9