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The old DRI2 buffer allocation API wasn't great, but there's no reason to make the server stop working with those drivers. This patch has the X server adapting to the API provided by the driver, using the new API where available and falling back to the old API as necessary. A warning will be placed in the log file when the old API is in use. Signed-off-by: Keith Packard <keithp@keithp.com>