Fix Qt applications freezing until mouse/keyboard events occur.

Fix Qt applications freezing until mouse/keyboard events occur.

While the qt_GetMessageHook() is executing, GetQueueStatus() reports
that there are timer messages in the queue, but these are never actually
seen by the hook. Calling PeekMessage() will never return these messages
(which is what we really want to know), so don't use GetQueueStatus()
with QS_TIMER.

Task-number: QTBUG-12721
Reviewed-by: denis
Reviewed-by: joao