unix: update zsysnum_darwin_amd64 for macOS 10.14
unix: update zsysnum_darwin_amd64 for macOS 10.14

Change-Id: I77f491029a8f2e37ffbda3d0f50795287d6cd641
Reviewed-on: https://go-review.googlesource.com/c/161720
Run-TryBot: Josh Bleecher Snyder <cdc248cc4d32e4fbfe04e45228163bcecd48a0b9@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

multiplay/golang-sys,multiplay/golang-sys,multiplay/golang-sys,golang/sys,golang/sys,multiplay/golang-sys,golang/sys