Remove --without-parallel (#16704)
Summary:
See homebrew/homebrew-core@60c72ba9 and homebrew/homebrew-core#31510.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16704
Differential Revision: D13938093
Pulled By: pietern
fbshipit-source-id: 8a70d462180257f96202a0373a86a273b524045c
