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wsi/x11: Fetch and discard the SYNC extension info

Adam Jackson requested to merge ajax/mesa:wsi-x11-sync-prefetch into main

Since we're not checking for this, xcb has to do it for us the first time we call xcb_sync_destroy_fence, which puts a blocking round-trip in the swapchain destroy path for no reason. Check for the extension so we have the extension's opcode cached when we need it.


Splitting this trivial prelude to !13179 (closed) out to merge.

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