internal/socket: add support for netbsd/arm64
internal/socket: add support for netbsd/arm64

Updates golang/go#30824

Change-Id: I872b725d6640e29570652171b6c45634fc21a461
Reviewed-on: https://go-review.googlesource.com/c/net/+/179939
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Benny Siegert <05f4aee36fd25d0de2a07789fd6e73398db492cc@gmail.com>

golang/net