patch applied (cabal): Compile a .c rather than a .hs file to make a .o file in ld -x configure test

[Duncan Coutts]

Wed Oct 24 08:05:05 PDT 2007  Duncan Coutts <duncan at haskell.org>
  * Compile a .c rather than a .hs file to make a .o file in ld -x configure test
  Since when bootstrapping ghc we're not in any position to compile .hs files
  that easily.

    M ./Distribution/Simple/GHC.hs -4 +4