Include all Caffe2 headers in Python installations (#16124)
Summary:
Confirmed on a local run that all the additional headers are present. This shouldn't be caught in any existing tests though.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16124
Differential Revision: D13720773
Pulled By: pjh5
fbshipit-source-id: 22a42639f5649cac555ecc5a8b6760a8cbfcf01f
