[vdr] VDR with S2API

[Klaus Schmidinger]

Just found a small flaw: the cDvbDevice::ProvidesTransponder() function
needs to be adapted to the fact that the delivery system is now an enum
and no longer a flag word:

bool cDvbDevice::ProvidesTransponder(const cChannel *Channel) const
{
  if (!ProvidesSource(Channel->Source()))
     return false; // doesn't provide source
  if (!cSource::IsSat(Channel->Source()))
     return true; // source is sufficient for non sat
  if (frontendType == SYS_DVBS && Channel->System() == SYS_DVBS2)
     return false; // requires modulation system which frontend doesn't provide
  return !Setup.DiSEqC || Diseqcs.Get(Channel->Source(), Channel->Frequency(), Channel->Polarization());
}

Maybe I'll map the SYS_DVB* stuff to a set of flags, so that these things
can be handled as comfortably as in the multiproto API...

Klaus