So that the dialog won't pop up again.

I've had it with this module. There is no support, let alone development, from the matroska folks anymore. I prefer to use ffmpeg which seems to be at least less crash prone and having more of a future. I'm not sure which features we are loosing due to this atm. Likely some meta info, probably ordered chapters and definetly the DVD menu capabilities.

forward of [89044739e9c4a152b1a15b0faedb88cb9e54f18c]

I removed:
 i_x/i_y: redondant with region i_x/i_y. Now a subpicture always represent the
 whole video.
 i_flags: unused anywhere in the core.

 I may have broken a few video filters (osdmenu mainly). I will fix it if you
report the problem and the way to reproduce it.

Fix unitialized pointer usages (possibly exploitable).

There is no functional changes.

Conflicts:

	NEWS

Fortunately, var_DelCallback does the job properly already.

libvlc kills the interfaces when it dies anyway.