2.17.4 Stuff:

- Fix for a recently reported security issue that has ID
 CVE-2006-6105.  This fixes a problem where a user can
 enter strings like "%08x" into the gdmchooser "Add"j
 host button and print out memory.  (Brian Cameron)

- Improvements to gdmsetup, which now supports many new
 features.  Fixes feature request #334186 and bugs
 #343206 and #347101.  (Lukasz Zalewski)

- No longer set XDG_SESSION_COOKIE if there is no cookie.
 Fixes #383866.  (William Jon McCann)

- Now the key and dwell gestures start Orca instead of
 Gnopernicus.  Must use Orca v2.17.4 or later to work
 with GDM.  (Brian Cameron)

- Translation updates (Kjartan Maraas, Daniel Nylander,
 Francisco Javier F. Serrador, Ilkka Tuohela)