Remove config.guess and config.sub
    - these used to have RH-specific hacks in them and %configure used to
      copy updated versions to builddir on invocation but neither is done
      now, these are just copies of upstream (libtool / automake) versions
      so there's no point dragging them along
    - some packages might expect to find them in /usr/lib/rpm/redhat/ so
      perhaps spec should copy them at build-time from automake/libtool
      to ensure a recent version