* 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.
Add getter for Mesa provider.
Export this for Xgl.
Move resource tracking out of drawable constructor to allow wrapping.
Use corrent reply size #define.
Add this function. (DoGetDrawableAttributes): Fix array length.
