[Bug 654945] implement new force-key-unit API in x264enc

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=654945
  GStreamer | gst-plugins-ugly | git

Bug 654945 depends on bug 607742, which changed state.

Bug 607742 Summary: add gst_event_new_force_key_unit: gst-plugins-base/gst-libs/gst/video/video.c
https://bugzilla.gnome.org/show_bug.cgi?id=607742

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

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