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Now even without using the hardware overlay, ordinary ump buffers
allocated in normal memory don't trigger excessive dri2 buffer
requests from the mali blob.

TODO:
* check for any possible memory leaks, ensure correct refcounting
* test windows resize behavior for both r3p0 and r3p2 blobs
* check if the EVEN/ODD frame order enforcing is still necessary for
  r3p2 (it could be just one more r3p0 quirk that is already gone)