Auto merge of #108196 - sunfishcode:sunfishcode/windows-as-socket-impls, r=dtolnay

Implement `AsHandle`/`AsSocket` for `Arc`/`Rc`/`Box` on Windows

Implement the Windows counterpart to #97437 and #107317: Implement `AsHandle` and `AsSocket` for `Arc<T>`, `Rc<T>`, and `Box<T>`.

Author: bors