Multi-frontend adapters (single tuner, multiple standards) provide
multiple frontend nodes and only one demux. So the device number
is only used when selecting the frontend.

I am going to assume that devices with multiple independent tuners
show as multiple adapters (otherwise this is totally screwed).

If the object has no references left, b_alive is irrelevant.

Attaching an object makes it visible in the hierarchy. This would have
been a problem in some cases with vlc_object_find(), but this function
was removed.

Nobody is ever going to use this if it needs to be enabled.

"wget does it" is not a sufficient reason to do it.

Close #3840

Win32 only, for some reason (Qt bug?)
Close #3976

Broken in 9b34074c

also remove obsolete configure option

As a side effect it is now build at the display size.