[gnome-session] Created tag 3.21.4

[Ray Strode <halfline src gnome org>]

The unsigned tag '3.21.4' was created.

Tagger: Ray Strode <rstrode redhat com>
Date: Fri Jul 22 13:35:37 2016 -0400

    3.21.4
    
    * Export renderer string for llvmpipe
    * Small heap overflow fix
    * Compiler warning fixes
    * misc doc fixes
    * Futureproof gettext support

Changes since the last tag '3.21.3':

Cosimo Cecchi (2):
      Remove all references to gnome-session-properties
      client: fix GCC warnings

Hanno Boeck (1):
      main: fix heap overflow in dbus-launch wrapping

Michael Catanzaro (2):
      check-accelerated: export renderer string also for llvmpipe
      fail-whale-dialog: Fix -Wmaybe-uninitialized warning

Piotr Drąg (1):
      Add Language headers to po files

Ray Strode (2):
      NEWS: Update for release
      configure: bump to 3.21.4