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Use weak functions to handle missing GBO mapping support

Carlos Rafael Giani requested to merge dv1/kmscube:master into master

gbm_bo_map()/gbm_bo_unmap() are not available on libMali. To make sure builds don't break and/or do not run properly on platforms with Mali GPUs, check at runtime whether or not BO mapping is supported. If it isn't, then videos won't show up on the cube (unless they are stored in DMA-BUF buffers), and the textured cube won't work.

Signed-off-by: Carlos Rafael Giani crg7475@mailbox.org

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