Use libunwind's version of unwind.h
libunwindbacktrace exports a version of unwind.h, but since we've
separated the object building from the linking in this makefile, we fall
back to the unwind.h that exists in our sysroot.
Define a dependency on libunwindbacktrace so that the include paths get
added during object compilation.
libunwind_llvm is used for arm, but it does not export any include
directories, so we'll fall back to the sysroot there.
Change-Id: If27508d480d474f8ce0dc7974a78fa04c9c674af
1 file changed
