i965/drm: Switch from uthash to Mesa's hash table.

No performance data has been gathered about this choice.  I just don't
want that many hash tables.  Chris points out that this is not
performance critical - we should not be recreating that many handles
from scratch.  In the past we used a linear list, which became
unreasonable in stress tests that used hundreds of thousands of BOs.
In real usage, it shouldn't matter that much.

Reviewed-by: Chris Wilson <[email protected]>
Acked-by: Jason Ekstrand <[email protected]>

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