[Patch] Android cross compile support

[Edward Z. Yang]

Looks fine to me; do we have people who are going to keep an eye on
Android and make sure things don't break?

Excerpts from Nathan Hüsken's message of Wed Jan 23 09:19:53 -0800 2013:
> Hey,
> 
> Appened is a patch that enables cross compilation to android.
> For the patch to work, config.guess and config.sub have to be updated to
> a newer version so that they recognize linux-android.
> 
> For the libraries some additional patches are needed, I will send them
> also to this list.
> 
> Will this patch be applied to ghc HEAD?
> 
> Regards,
> Nathan