Remove the unused waveglow requirements file (#716)
Summary:
These files are not used, but they causes dependbot to complain about using deprecated numpy versions (such as https://github.com/pytorch/benchmark/issues/714 and https://github.com/pytorch/benchmark/issues/713 )
Pull Request resolved: https://github.com/pytorch/benchmark/pull/716
Reviewed By: aaronenyeshi
Differential Revision: D33781655
Pulled By: xuzhao9
fbshipit-source-id: 85dd00d85a21ca0d1b1da68bd569b143f133487a