happy-eyeballs: Move happy_eyeballs_destroy to a thread

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On Windows, shutdown() will not interrupt a blocking connect() call, so
happy_eyeballs_destroy could block until the remaining candidates timed
out. As happy_eyeballs_destroy is called in the RTMP connect path, this
would stall the RTMP connection and cause the winning candidate's socket
to be disconnected due to a timeout.

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