Constantly recreated zero timers will starve the event queue on Symbian

Take a look at the tst_QTimer::QTBUG13633_dontBlockEvents() testcase. It will starve the event queue because it constantly recreates timers. In this case, the code in Qt which tries to detect if events have already happened (using QActiveObject) will fail, and the timer will fire over and over, leading the testcase to hang.