Uniformly apply Windows logic in cpp_extensions everywhere (#31161)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31161
Previously, it wasn't necessary to specify `DT_NEEDED` in C++ extensions on Linux (aka pass `-l` flags) because all of the symbols would have already been loaded with `RTLD_GLOBAL`, so there wouldn't be any undefined symbols. But when we switch to loading `_C` with `RTLD_LOCAL`, it's now necessary for all the C++ extensions to know what libraries to link with. The resulting code is clearer and more uniform, so it's wins all around.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D19262578
Pulled By: ezyang
fbshipit-source-id: a893cc96f2e9aad1c064a6de4f7ccf79257dec3f
