Merge MIPS libc-abis into top-level

[Joseph S. Myers]

On Tue, 28 Oct 2014, Matthew Fortune wrote:

> I think your suggestion is sufficient to cover the likely needs of
> libc-abis. Since this only affects the glibc build system and internals
> then it can always be made more elaborate when faced with some complex
> scenario.
> 
> Unless you have an objection I'm happy to re-post your suggestion on a new
> thread to get consensus.

I do not have an objection.

-- 
Joseph S. Myers
joseph@codesourcery.com