Use usleep instead of sleep(0).

sleep(0) is unfortunately not specified.

Change-Id: I5e9c626d21a562ca04329c0cc039a1f3a71dfc84
diff --git a/test/604-hot-static-interface/hot_static_interface.cc b/test/604-hot-static-interface/hot_static_interface.cc
index 71877f5..9074a0a 100644
--- a/test/604-hot-static-interface/hot_static_interface.cc
+++ b/test/604-hot-static-interface/hot_static_interface.cc
@@ -49,7 +49,7 @@
       break;
     } else {
       // Sleep to yield to the compiler thread.
-      sleep(0);
+      usleep(1000);
       // Will either ensure it's compiled or do the compilation itself.
       jit->CompileMethod(method, Thread::Current(), /* osr */ false);
     }