use of "golang.org/x/sys" instead of "syscall"?

[crmackay]

Just wondering if there was a reasoning for using the syscall package, over the golang.org/x/sys package. The syscall documentation says that it is locked and no longer being updated or maintained, and that users should migrate to the sys package.

NOTE: This package is locked down. Code outside the standard Go repository should be migrated to use the corresponding package in the golang.org/x/sys repository. That is also where updates required by new systems or versions should be applied. See https://golang.org/s/go1.4-syscall for more information.