Bug#796270: Please disable jasper support

[Moritz Muehlenhoff]

Source: gdk-pixbuf
Severity: important

Hi,
please disable jasper support in gdk-pixbuf. It's an abandoned
code base with frequent security issues and JPEG2000 is an
exotic fringe format unused in practice.

We can keep it in the archive for scientific software etc, but
let's not expose via gdk-pixbuf to exposed applications like
Iceweasel.

Cheers,
        Moritz