[PATCH] dri2: Preserve compatibility with 1.6 DRI2 API/ABI

[Ian Romanick]

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Keith Packard wrote:
> 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.

The problem with this, and the reason I didn't do this in the first
place, is that this always advertises DRI2 version 1.1 to the
client-side even when the driver does not support it.
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