[PATCH] Improve the unwind.h inclusion

[Sylvestre Ledru]

  I haven't dig enough in this to answer to your question about unwind.h itself.

  It is just that I needed this patch when building with the package installed (I used to hardcode the path to the clang library).
  I think that applying this patch might save some time to the other packagers (but it might no longer be relevant).

http://llvm-reviews.chandlerc.com/D2150