Fix QNNPACK and NNPACK settings (#22367)
Summary:
`setup.py` recommends setting `USE_QNNPACK=0` and `USE_NNPACK=0` to disable building QNNPACK and NNPACK respectively. However this wasn't reflected correctly because we were looking for `NO_QNNPACK` and `NO_NNPACK`. This PR fixes it.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22367
Differential Revision: D16067393
Pulled By: soumith
fbshipit-source-id: 6491865ade9a6d41b7a79d68fd586a7854051f28
