try to find cudnn header in /usr/include/cuda (#31755)
Summary:
With fedora negativo17 repo, the cudnn headers are installed in /usr/include/cuda directory, along side with other cuda libraries.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31755
Differential Revision: D19697262
Pulled By: ezyang
fbshipit-source-id: be80d3467ffb90fd677d551f4403aea65a2ef5b3
