[gdm] Created tag 3.23.4

[Ray Strode <halfline src gnome org>]

The unsigned tag '3.23.4' was created.

Tagger: Ray Strode <rstrode redhat com>
Date: Thu Jan 5 13:29:58 2017 -0500

    Version 3.23.4
    
    - Make X11DisplayName property accurate
    - Fix bug that forced wayland on second logins even if user didn't pick it
    - kill clients from display on logout (multiseat and xdmcp only)
    - send hangup to process group when session exits
    - allow specifying pam_gdm install location to configure

Changes since the last tag '3.22.1':

Mathias Reck (1):
      daemon: update X11DisplayName on register display

Ray Strode (8):
      manager: make sure we retain ignore-wayland on second login
      display: close X11 connection
      display: port GdmDisplay to xcb
      xdmcp-display-factory: notify remote display when session ended
      worker: kill process group when session exits
      slave: kill off clients from display when finished
      NEWS: update for release
      configure: bump to 3.23.4

Rémi Cardona (1):
      pam_gdm: allow setting pam module dir at configure time