patch applied (ghc-6.12/ghc): Pass the location of gcc in the ghc wrapper script; partially fixes #3863

[Ian Lynagh]

Wed Mar 24 10:14:08 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Pass the location of gcc in the ghc wrapper script; partially fixes #3863
  This means we don't rely on baking a path to gcc into the executable

    M ./distrib/configure.ac.in -1 +6
    M ./ghc/ghc.wrapper -1 +1
    M ./rules/shell-wrapper.mk +2