Bug#796956: sddm no more start this morning after update

[Eric Valette <eric2.valette@orange.com>]

Package: sddm
Severity: critical
Justification: breaks unrelated software

Dear Maintainer,

This norning sddm refused to load. Logged on the konsole, make the upgrade,
upgraded breeze also but no effect. I had to deinstall it, and use kdm.
This worked.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.1.6 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF8, LC_CTYPE=en_US.UTF8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)