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vrend: conditionally build using gbm_bo_get_map_info()

Ryan Neph requested to merge ryanneph/virglrenderer:rn-minigbm-get-map-info into main

Use the more accurate gbm_bo_get_map_info() API recently provided by minigbm when it is available.

This fixes issues with Intel devices that don't have a shared LLC between CPU and GPU cores to enforce coherency of cached accesses.

It also ensures forward-compatability with other drivers that don't match the heuristic here.

Signed-off-by: Ryan Neph ryanneph@google.com

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