Fix Windows guards in c10d (#59696)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59696
Some files in c10d refer to dist autograd. However, on Windows, dist autograd isn't built. Hence we need to "mask out" those references under Windows. This was already partly done, but when moving c10d to libtorch some issues came up, possibly due to the different way in which linking happens. Hence I masked out the remaining references.
ghstack-source-id: 131169541
Test Plan: CI
Reviewed By: agolynski
Differential Revision: D28987579
fbshipit-source-id: c29c5330f8429d699554972d30f99a89b2e3971d
