fix missing non specialized windows sleep fn

Author: dvdsk

library/std/src/sys/pal/windows/thread.rs

@@ -116,6 +116,14 @@ impl Thread {
         }
     }
 
+    pub fn sleep_until(deadline: Instant) {
+        let now = Instant::now();
+
+        if let Some(delay) = deadline.checked_duration_since(now) {
+            sleep(delay);
+        }
+    }
+
     pub fn handle(&self) -> &Handle {
         &self.handle
     }