[MacPorts] #66103: muniversal portgroup header merging doesn't work on Ventura: diff: unrecognized option `--old-group-format=#ifdef __arm64__

[MacPorts]

#66103: muniversal portgroup header merging doesn't work on Ventura: diff:
unrecognized option `--old-group-format=#ifdef __arm64__
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  Reporter:  Morpheus-HH        |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.8.0
Resolution:                     |   Keywords:  ventura
      Port:  libffi, ossp-uuid  |
--------------------------------+---------------------

Comment (by kencu):

 The dep list on older systems is onerous as older clangs are all
 blacklisted, so if this switch to diffutils is done, perhaps it would be
 only for Ventura+. And we really don't like that idea much either, as
 different diffs on different platforms is just another recipe for
 troubles.

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Ticket URL: <https://trac.macports.org/ticket/66103#comment:14>
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