Bug#1034732: Keep out of testing

[Moritz Muehlenhoff <jmm@debian.org>]

Package: gpac
Version: 2.0.0+dfsg1-2+b1
Severity: serious

In some discussion between Reinhard, Sebastian and the Security team we've come to the
conclusion that gpac isn't suitable to be included in a stable release. The massive
influx of security issues makes that untenable (and there's no suitable LTS branch
we could use, which e.g. makes ffmpeg manageable).

Sebastian has already updated x264 to no longer depend on it, when x264
2:0.164.3095+gitbaee400-3 has reached testing, gpac can be dropped. The only
other rdep in ccextractor, which is already out of testing due to a lack of
support for ffmpeg 5.

Cheers,
        Moritz