* Merge from Debian unstable. Remaining changes:
  - debian/control:
    + Recommend light-locker settings | xfce4-power-manager.
    + Build-depend on liblightdm-gobject-1-dev instead of
      liblightdm-gobject-dev.
  - debian/rules: Build with no-lock-on-suspend and late-locking support.
* debian/patches:
  - 02_libsystemd added, build against libsystemd, patch from Michael Biebl.
                                                              closes: #779749