glx, egl: Add LIBGL_DRI2_DISABLE environment variable
For orthogonality with LIBGL_DRI3_DISABLE. Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7688>
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@@ -23,6 +23,8 @@ LibGL environment variables
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``LIBGL_SHOW_FPS``
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print framerate to stdout based on the number of ``glXSwapBuffers``
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calls per second.
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``LIBGL_DRI2_DISABLE``
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disable DRI2 if set to ``true``.
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``LIBGL_DRI3_DISABLE``
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disable DRI3 if set to ``true``.
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