* GL/glx/glxvisuals.c: added boolean to disable
calling init_visuals(). This gives a chance to Xephyr
to take over visuals manipulation and avoid a crash at
server shutdown in __glXMesaScreenDestroy(), due to the fact
that mesa might sees more visual than what it has actually created in
init_visuals(). It might see more visuals because Xephyr can augment
the number of visuals, dynamically.
* os/utils.c: the boolean is actually defined here.
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