archivers/macutils: Deprecate, set 3 month expiration
Macutils hasn't had a maintainer in over 16 years. The build log is
filled with warnings about mismatching protocols, some of which are
caused by the many missing header includes and other caused by
rerolling standard functions like malloc.
Although there is no listed WWW, maybe there's a new version somewhere.
Set expiration 3 months out to give people plenty of time to fix and
or adopt this ancient port.
While here, bring in a dports CFLAG to fix build there.