Bug#950473: Please stop using deprecated <selinux/flask.h> and <selinux/av_permissions.h> headers

On Sun, May 31, 2020 at 05:30:30PM +0200, Laurent Bigonville wrote:
> libselinux 3.1 rc1 has been uploaded in experimental and I'm planning to
> upload the final version in unstable as soon as it's released in the
> upcoming days/weeks.
> 
> Could you please make sure that your package is ready? This will make your
> package FTBFS as the <selinux/flask.h> and <selinux/av_permissions.h>
> headers will be gone.

Ugh, sorry for the inconvenience - I'd neglected to subscribe to
openssh-ssh1 bugs and so didn't notice this report.  Fixing now.