Clean up //caffe2/torch-cpp to avoid duplicated symbols (#21916)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21916
Hopefully fixes https://fb.workplace.com/groups/1405155842844877/permalink/2832659000094547/
Reviewed By: rutyrinott
Differential Revision: D15862128
fbshipit-source-id: 77c01a57bddc39b267e307b50942e029a381711b
