[LightDM] lightdm 1.21.4 released

[Robert Ancell]

Overview of changes in lightdm 1.21.4

    * Use power management functions from ConsoleKit2 if available.
    * Correctly pass return value from sessions to LightDM.
    * Retry VT_WAITACTIVE if we get EINTR.
    * Ignore SIGHUP by default.
    * Use SA_RESTART with SIGPIPE.
    * liblightdm-qt: Use liblightdm-gobject power methods instead of
      re-implementing in Qt.

https://launchpad.net/lightdm/+download
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