x11: Only report supported DRI3/Present versions

The version passed to QueryVersion requests is the version that the
client supports. We were just passing in whatever version of XCB was
present on the system, which may not be a version that Mesa actually
explicitly supports, e.g. it might bring unwanted semantics.

Set specific protocol versions which we support, and only pass those.

Signed-off-by: Daniel Stone <[email protected]>
Fixes: 7aeef2d4efd ("dri3: allow building against older xcb (v3)")
Reviewed-by: Emil Velikov <[email protected]>

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