Bug#938614: Unlikely to be ported

[Moritz Mühlenhoff]

On Mon, Nov 11, 2019 at 12:44:45PM +0000, Jelmer Vernooij wrote:
> FWIW it looks unlikely that upstream will migrate to Python 3 in the
> near future; see e.g.
> https://github.com/syncthing/syncthing-gtk/pull/475

Let's remove it for now, then? This blocks a number of Py2 removals
at this point.

Cheers,
        Moritz