Fix errors reported by clang++-2.9.
* src/evtgbaalgos/tgba2evtgba.cc (process_link): Fix prototype to match tgba_reachable_iterator::process_link. * src/ltlvisit/tunabbrev.hh: Add using super::visit, so that the other visit() method are in scope when we overload one. * src/tgba/tgbareduc.hh, src/tgba/tgbareduc.cc (start, end, process_link): Remove these empty methods. The default implementations are empty too, and process_link had the wrong prototype. * src/tgbaalgos/reductgba_sim.hh, src/tgbaalgos/reductgba_sim.cc (start, end, process_link): Likewise.
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