dvdnav: block when libdvdnav requests draining buffers

Not sure how this should work. Using libdvdnav with a large FIFO doesn't
make sense either: data and control commands use the same stream, so if
you want to send input to libdvdnav, you just have to read from
libdvdnav all the time to get a reaction, which is not compatible with
maintaining a buffer that could remain full for a long time.

I have no idea either whether this improves or worsens anything, though
it might be more correct.

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