Revert "Default to not build Caffe2 operators on Windows. (#29061)" (#30740)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30740
This reverts commit 7102aceaf88ab71781c6019458bd7a07e86a532f.
Test Plan: Imported from OSS
Differential Revision: D18834315
Pulled By: ezyang
fbshipit-source-id: 2dbd1cf686864b9840365083182cd6188a285399
