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