Peter Hawkins a999120514 Improve error message when cudnn is not found.
We infer a missing cudnn if cudnnGetVersion() returns 0, since the stub implementation in TSL will do that if the library isn't found (10a378f499/third_party/tsl/tsl/cuda/cudnn_stub.cc (L58)).

PiperOrigin-RevId: 587056454
2023-12-01 10:52:48 -08:00
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