Mutter 3.8.4 Fixes Some Fullscreen Gaming Issues

Mutter 3.8.4 adds a workaround for bug 701224, related to failure of bringing back the shell interface after a fullscreen game in some situations, fixes stuck and sluggish pointers moving windows, touch screen issues, rendering of large background images, and reduces log spew. Mutter 3.9.5 has been modified to no longer select touch events on the stage and to no longer queue redraws for obscured regions. Timestamp of global keybinding events can now be exported, and miscellaneous bugs have been fixed.