[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__
--------------------------------+--------------------
  Reporter:  Morpheus-HH        |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.8.0
Resolution:                     |   Keywords:  venura
      Port:  libffi, ossp-uuid  |
--------------------------------+--------------------

Comment (by dkoes):

 I modified
 `/opt/local/var/macports/sources/rsync.macports.org/macports/release/tarballs/ports/_resources/port1.0/group/muniversal-1.0.tcl`
 to use a GNU diff instead of `/usr/bin/diff` and successfully built
 libffi.

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Ticket URL: <https://trac.macports.org/ticket/66103#comment:10>
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