Add __unused macro similar to what is used by Net and Free. OK cloder@, grange@, djm@
Add __unused macro similar to what is used by Net and Free.
OK cloder@, grange@, djm@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars