[v3] c++0x includes

[Benjamin Kosnik]

> I suspect a better way to package this work is to just not touch the 
> default "C" includes and instead clone a new model, ie
> 
> --enable-cheaders=c_global
> 
> which will do this part.
> 
> That way I can check a version of this in and it can be worked on 
> incrementally...

Here is the previous patch + as above. Default config seems fine, same 
as before. Seems the smarter way to go.

I'll not be able to check this in for a week. When I get back I'll see 
what's up.

-benjamin

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