runtime: use pipe2 for nonblockingPipe on dragonfly
The pipe2 syscall is available since DragonflyBSD 4.2, see https://www.dragonflybsd.org/release42/ Change-Id: Ifc67c4935cc59bae29be459167e2fa765843ac03 Reviewed-on: https://go-review.googlesource.com/c/go/+/295471 Trust: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Ian Lance Taylor <iant@golang.org>
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