Remove references to `typing` module from setup.py (#47677)
Summary:
It is part of core Python-3.6.2+
Fixes https://github.com/pytorch/pytorch/issues/47596
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47677
Reviewed By: walterddr
Differential Revision: D24860188
Pulled By: malfet
fbshipit-source-id: ad72b433a4493ebe5caca97c2e8a9d4b3c8172d4
