RLock lazy import, fixes race condition seen in experimental/mt_media/test1.py.  XXX will need to ensure all pyglet internal imports are either locked or lazy.
RLock lazy import, fixes race condition seen in
experimental/mt_media/test1.py.  XXX will need to ensure all pyglet internal
imports are either locked or lazy.



git-svn-id: d4fdfcd4de20a449196f78acc655f735742cd30d@2162 14d46d22-621c-0410-bb3d-6f67920f7d95

regular/pyglet-avbin-optimizations,regular/pyglet-avbin-optimizations,regular/pyglet-avbin-optimizations,regular/pyglet-avbin-optimizations