patch applied (cabal): Only use ld -x on systems where ld supports that.

Tue Oct 23 11:37:38 PDT 2007 Duncan Coutts * Only use ld -x on systems where ld supports that. Hopefully this fixes it for both ordinary builds and via ghc makefiles. M ./Distribution/Simple/GHC.hs -5 +25 M ./Distribution/Simple/GHC/Makefile.in -1 +1