With just "skins" and "qt", only those specific interfaces would be
probed. Thus VLC could not be started from X-less command line.

If luarc is mature enough to replace oldrc, then I guess this is not
needed anymore

There's no reasons not to enable DVB support if libdvbpsi is present
and the kernel headers are present. It does not add any dependency over
the TS demux.

DVB headers were merged with Linux 2.5, so there is really no use for
--with-dvb anymore.

This fixes a crash with VoD when all tracks were not set up

This fixes problems with lost characters and failure to close
connections in some cases

No functionnal change

Should fix #4561, thanks to stiger

This is a follow-up to dae71aacSigned-off-by: Felix Paul Kühne <fkuehne@videolan.org>

I think this should be optimised to rotate symbolrates only
when we get signal but were unable to tune channels.

This commit also causes that eta shows even more strange
times until it gets lock on some channel with correct
modulation/symbolrate.