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loader/dri3: Overhaul draw->cur_num_back handling

Michel Dänzer requested to merge daenzer/mesa:loader-dri3-overhaul-cur_num_back into main

draw->cur_num_back is no longer used for immediately reducing the number of allocated back buffers. It just reflects how many of them are currently allocated, and is used to prevent allocating more if the current maximum is already reached.

This fixes an issue where the current in-progress back buffer could get freed, which would result in visible artifacts.

Unused buffers are freed once they reach buffer age 1000. This ensures we do not keep around more buffers than necessary in the long run.

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