[MacPorts] #62847: opencv4: fix build failures for MacOS 10.7 and 10.8

[MacPorts]

#62847: opencv4: fix build failures for MacOS 10.7 and 10.8
----------------------+----------------------
  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  opencv4  |
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Comment (by Christopher Nielsen <mascguy@…>):

 In [changeset:"81728bfa7dc91877aecdd83877652ce49e1435fb/macports-ports"
 81728bfa7dc91877aecdd83877652ce49e1435fb/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="81728bfa7dc91877aecdd83877652ce49e1435fb"
 opencv4: revert to 4.5.0 for MacOS 10.8 and earlier

 See: https://trac.macports.org/ticket/62847
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62847#comment:4>
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