net: use internal/poll for DragonFly setKeepAlivePeriod
Fixes DragonFly build. Change-Id: Id6b439cd4023ea8e3ed7cd9b70eec553c9eee4be Reviewed-on: https://go-review.googlesource.com/36916 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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