Do not delete rpath from torch.dylib on Darwin (#47337)
Summary:
Fixes CI regressions introduced by https://github.com/pytorch/pytorch/issues/47262
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47337
Reviewed By: ngimel
Differential Revision: D24721954
Pulled By: malfet
fbshipit-source-id: 395b037b29c0fc3b62ca50bba9be940ad72e0c5b
