Search the debug ELF for .gnu_debugaltlink if it's not in the "main" one
Search the debug ELF for .gnu_debugaltlink if it's not in the "main" one

If we have a separate debug image, the gnu_debugaltlink may only be in
that, so search there too. Also, because the path may be relative to the
eventual ELF object containing the section, use that eventual ELF file
in the section, not the local one.

peadar/pstack,peadar/pstack,peadar/pstack,peadar/pstack