patches for building a cross-compiling GHC

[Edward Z. Yang]

Excellent work.  Would you like me to push your docfix patch?

Cheers,
Edward

Excerpts from Mark Lentczner's message of Fri Apr 15 16:00:28 -0400 2011:
> My patches have been cleaned up and are available at
> 
> git://github.com/mtnviewmark/ghc.git
> 
> in the *cross* branch
> 
> These add additional variables and changes to the configure scripts and a
> few .mk files to handle the multiple tool-chains needed during building a
> cross-compiler. These are the changes described in the cross-compiling wiki
> page.
> 
> Under normal builds, these changes have no effective change.