Fix build error in c10 on Windows (#21005)
Summary:
Targets https://github.com/pytorch/pytorch/issues/20635#issuecomment-496265510
Reference:
1. https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=vs-2015#microsoft-specific-predefined-macros
2. https://docs.microsoft.com/en-us/cpp/cpp/deprecated-cpp?view=vs-2019
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21005
Differential Revision: D15543134
Pulled By: ezyang
fbshipit-source-id: f32709b018a7de651cb31575fc6117bfc4dd3bd1
