Makes sure the prefs window does not stay on top and hides
all other applications if VLC is inactive.

OpenSSL is the default if both exist

Ref #13826

This matches the ALSA implementation now.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

If the first program of the PAT has no PMT or no ES, we will get stuck forever.
Return from demux probe immediately, to let user select the desired program later.

For example on Astra S19.2E:
dvb:// --dvb-frequency 12551500 --dvb-polarization V --dvb-srate 22000000 --dvb-fec 5/6

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>