macro is defined in lots of different places in ipfilter, so replace all
of the nonportable definitions with portable ones.
Pointy hat to: dim
X-MFC-With: r304959, r304953
MFC after: 3 days
import of new ipfilter vendor sources by flattening them.
To keep the tags consistent with dist, the tags are also flattened.
Approved by: glebius (Mentor)
