optimisation: intra_prediction() uses a 16-bit numerator for the search
optimisation: intra_prediction() uses a 16-bit numerator for the search

mumble-voip/celt-0.7.0,oneman/opus-oneman,Distrotech/celt,mumble-voip/celt-0.11.0,mumble-voip/celt-0.11.0,dezelin/celt,mumble-voip/celt-0.7.0,oneman/opus-oneman,dezelin/celt,Distrotech/celt,mumble-voip/celt-0.7.0,mumble-voip/celt-0.11.0,Distrotech/celt,dezelin/celt,oneman/opus-oneman