Only return events from ppoll that were requested.V_8_9

If the underlying system's select() returns bits that were not in the
request set, our ppoll() implementation can return revents for events
not requested, which can apparently cause a hang.  Only return revents
for activity in the requested event set.  bz#3416, analysis and fix by
yaroslav.kuzmin at vmssoftware com, ok djm@

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