Revert "Fix the caffe2_gpu linkage with torch on Windows" (#21335)
Summary:
The original PR (#16071) is not working anymore after `caffe2` and `torch` is unified. What's more, It is making the binary big since the optimizing flag is disabled on a very big project(the `torch` library used to be small, but it now applies on the whole `caffe2` and `caffe2_gpu` library). We need to get it reverted.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21335
Differential Revision: D15622163
Pulled By: soumith
fbshipit-source-id: 900bd400106d27a1512eed1e9f2288114f5f41bb
