rnnt setup failed bacause of "THC.h" not found

[xuzhao9]

RNNT model requires a third party library warp-transducer, which includes a deprecated pytorch header file, THC.h.

This file can't be found in current pytorch source code directory: https://github.com/pytorch/pytorch/tree/master/aten/src/THC

[aaronenyeshi]

@nrsatish , @erichan1 - we may need to migrate to the Torch Audio RNN-T Conformer recipe. It seems THC.h is being deprecated in pytorch? CC @ngimel

[ngimel]

THC has been deprecated long ago, and old third-party libraries that are no longer maintained can no longer be used.