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GLX: Remove the XESetCloseDisplay callback during teardown.

Kyle Brenneman requested to merge kbrenneman/libglvnd:libglx-cleanup-display-callbacks into master

This fixes a crash that can happen if libGLX.so is loaded dynamically, and then unloaded while an X display is still connected.

In that case, the callback that libGLX registered with XESetCloseDisplay is still registered, and XCloseDisplay will try to call a dangling function pointer and crash.

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