Add Android related compilation options and multilib options

[Mark Mitchell]

Joseph S. Myers wrote:

> But you should also be able (in the multi-target compiler world) to say 
> "configure for arm-eabi with these multilibs, and for arm-linux-gnueabi 
> with those multilibs", and have a compiler built that supports both those 
> targets and has the given set of multilibs for each of them. 

Yes.

> (In turn, it 
> should be possible to add multilibs after the compiler was built without 
> rebuilding the compiler, and tell it how to find them.)

Yes, again.

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
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