[MacPorts] #65619: libfmt @9.x: upstream changes break dependents; create new segregated port libfmt8

[MacPorts]

#65619: libfmt @9.x: upstream changes break dependents; create new segregated port
libfmt8
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  Reporter:  mascguy                         |      Owner:  mascguy
      Type:  defect                          |     Status:  assigned
  Priority:  Normal                          |  Milestone:
 Component:  ports                           |    Version:  2.7.2
Resolution:                                  |   Keywords:  pending
      Port:  libfmt cantera poac mkvtoolnix  |
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Comment (by mascguy):

 Update: I'm almost done with migrating `libfmt` dependents, with two
 troublesome ports left: `cherrytree` and `openimageio`. Once those are
 fixed, I'll push all of the changes.

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Ticket URL: <https://trac.macports.org/ticket/65619#comment:15>
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