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GLX_SWAP_INTERVAL_EXT is always positive, GLX_LATE_SWAPS_TEAR_EXT is how
you tell whether the drawable is set to do it. This aligns us with the
spec and NVIDIA's GLX.
Closes: #10193
Fixes: 5e9e4573 glx/dri3: Implement GLX_EXT_swap_control_tear
Part-of: <!31655>
