ole32:fix CoWaitForMultipleHandles cause RPC hang

[Changhui Liu]

Because there's a RPC request need to be handled by OLE apartment window proc apartment_wndproc.
So, after received a WM_QUIT, 
if the GUI thread in calling CoWaitForMultipleHandles don't handle message loop any more ,
the RPC will never be handled, the RPC dispatch thread will be hang.
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