_WaitHandleFuture.cancel() now notify IocpProactor through the overlapped object that the wait was cancelled.
_WaitHandleFuture.cancel() now notify IocpProactor through the overlapped
object that the wait was cancelled.

vxgmichel/asyncio,manipopopo/asyncio,jashandeep-sohi/asyncio,gvanrossum/asyncio,ajdavis/asyncio,Martiusweb/asyncio,gsb-eng/asyncio,manipopopo/asyncio,manipopopo/asyncio,jashandeep-sohi/asyncio,haypo/trollius,vxgmichel/asyncio,ajdavis/asyncio,jashandeep-sohi/asyncio,gsb-eng/asyncio,vxgmichel/asyncio,fallen/asyncio,fallen/asyncio,1st1/asyncio,gvanrossum/asyncio,1st1/asyncio,Martiusweb/asyncio,haypo/trollius,ajdavis/asyncio,haypo/trollius,1st1/asyncio,Martiusweb/asyncio,gvanrossum/asyncio,fallen/asyncio,gsb-eng/asyncio