Retain libc.so.6 debuglink section, remove ld.so debuginfo file (#2090744)
    
    This commit fixes wrap-find-debuginfo.sh so that:
    * the .gnu_debuglink section of libc.so.6 is retained, and
    * the redundant debuginfo file generated for ld.so is removed
    
    Co-Authored-By: Benjamin Herrenschmidt <benh@amazon.com>
    Reviewed-by: Florian Weimer <fweimer@redhat.com>