Make 045.phpt busy wait

The timeout is only real-time based on Windows. Make this use
a busy wait loop instead. If hard_timeout is broken, this will
fail with a run-tests enforced timeout instead.

tests/lang/045.phpt

@@ -13,13 +13,7 @@ set_time_limit(1);
 register_shutdown_function("plop");
 
 function plop() {
-    $ts = time();
-    while(true) {
-        if ((time()-$ts) > 2) {
-            echo "Failed!";
-            break;
-        }
-    }
+    while (true);
 }
 plop();
 ?>