[gdm] (3 commits) Non-fast-forward update to branch make-gdm-listen-better

[Ray Strode <halfline src gnome org>]

The branch 'make-gdm-listen-better' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  4bd9ac9... daemon: Support X servers built with -Dlisten_tcp=true

Commits added to the branch:

  e3a6b65... libgdm: Handle GDM_SUPPORTED_SESSION_TYPES being unset (*)
  f7aaba5... Merge branch 'wjt/handle-missing-GDM_SUPPORTED_SESSION_TYPE (*)
  552245e... daemon: Support X servers built with -Dlisten_tcp=true

(*) This commit already existed in another branch; no separate mail sent