Possible soundness issue in ChildImp::wait

[gigaroby]

While conducting an internal unsafe review, we identified a possible soundness issue in ChildImp::wait

command-group/src/tokio/child/windows.rs

Lines 100 to 104 in b88296f

	pub async fn wait(&mut self) -> Result<ExitStatus> {
	let handles = self.handles.clone();
	spawn_blocking(|| Self::wait_imp(handles, INFINITE)).await??;
	self.inner.wait().await
	}

This function and the one below call the Clone impl that appears to undermine the unsafe Drop impl on self.handles.

[passcod]

This is the same root issue as the other one you just opened, yeah?