Bug#939907: stretch-pu: package libsixel/1.5.2-2+deb9u1

["Adam D. Barratt" <adam@adam-barratt.org.uk>]

On Thu, 2019-09-19 at 10:02 +0900, NOKUBI Takatsugu wrote:
> I uploaded fixed package for stretch.
> This fix #931311, CVE-2018-14072 and CVE-2018-14073.
> 
> A little bit changed debdiff is here:

As with the buster upload, the binary dependencies on the uploaded
package look a little odd. I've flagged that for rejection, please re-
upload as a source-only upload (ensuring that the changes file is
_source.changes) so we can ensure that all of the binaries are built
cleanly.

Regards,

Adam