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virgl/gbm: exported read/writable buffers

David Stevens requested to merge dgstevens/virglrenderer:gbm-export-rdwr into master

With old DRM implementations, drmPrimeHandleToFD always returned a fd that could be mapped read/write. However, new kernels require the DRM_RDWR flag to be specified to create read/write mappings.

Try passing the DRM_RDWR flag but fall back to the old way if that fails.

Signed-off-by: David Stevens

Edited by David Stevens

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