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Fix `sys::process::windows::tests::test_thread_handle` spurious failure Instead of sleeping, wait for the process to finish so that we can be sure it's done. We use a timeout because otherwise this test can be stuck indefinitely if it fails (unfortunately std doesn't currently have a way to wait with a timeout so a manual OS API call is necessary). I also changed the test to run `whoami` and pipe the output to null so that it doesn't clutter up the test output. Fixes rust-lang/rust#146024