Add thread sleep function

src/thread_win.c

@@ -79,6 +79,12 @@ bh_thread_t *bh_thread_new_base(bh_task_t *task,
     return result;
 }
 
+int bh_thread_sleep(unsigned long timeout)
+{
+    Sleep(timeout);
+    return BH_OK;
+}
+
 int bh_thread_join(bh_thread_t *thread)
 {
     /* Join the thread */