[MacPorts] #72159: genie: fix build failure due to macosx-version-min=11.0

[MacPorts]

#72159: genie: fix build failure due to macosx-version-min=11.0
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.10.5
Resolution:           |   Keywords:
      Port:  genie    |
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Comment (by jmroot):

 This is on OS versions older than 11, I assume?

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Ticket URL: <https://trac.macports.org/ticket/72159#comment:1>
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