Remove debugging code introduced by accident in locore.s revision 1.357
Inline trivial helper function.
- npf_nat_freepolicy: handle a race condition when a new connection might
  be associated with a NAT policy which is going away and npfctl reload
  would wait for its natural expiration (potentially long time).
- Remove npf_ruleset_natreload() by merging into npf_ruleset_reload().
- npf_ruleset_reload: eliminate a small time period when a valid NAT
  policy might be inactive during the reload operation.
Fix munmap(2) signature.
Regen for munmap(2) signature.
Add a variable CDMAKEFSEXTRAOPTS to provide additional parameters to the
makefs invocation that do not belong in the image option list (CDMAKEFSOPTIONS)
Instead of running MAKEDEV inside the image content dir (which would only
work for root), make it emit a mtree spec file and pass that to makefs.
This should also work for unprivileged builds.
Problem pointed out by Izumi Tsutsui.
example for port remapping added