This was disabled by a2deb59a and does
not even compile anymore.

(Code is suspicious though.)

With older versions, client support pretty much does not work.

Make fails when using FFmpeg libavcodec version newer than checked by
LIBAVCODEC_VERSION_CHECK, because of redeclaration of many enumerators,
that are unnecessary with newer version of libavcodec library.
It is due to missing parenthesis in macro definition that are making
it wrong.

Probably same with libav libavcodec library, too.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Big pile of non-sensical and unmaintained code.

Nothing calls vlc_object_kill() on the playlist.

The ncurses thread is stuck in getch(). Checking vlc_object_alive()
does not solve anything.

Confusingly enough, aout_filter_RequestVout() is also used to release
the vout. In that case, ignoring the return value is perfectly fine.

This fixes mysterious interface crashes during startup, because of wrong / corrupt
initialization of several objects.