r189535 - Add missing definitions to unwind.h.

[Joerg Sonnenberger]

On Thu, Aug 29, 2013 at 11:45:51AM -0700, Peter Collingbourne wrote:
> 
> Nothing other than the header guard.  We will probably either have
> to protect our definition like this:
> 
> #if !defined(__ANDROID__) || !defined(__arm) || !defined(_LINK_H_)
> 
> or declare that Android's header is broken, and modify compiler-rt
> to avoid including both headers in the same TU.  I'm tending towards
> the latter given that GCC's unwind.h has a similar "problem".

Or just remove the additional defines. I don't see the point in them.

Joerg