[MacPorts] #53338: ogre @1.7.3_4 fails on Sierra -- "invalid deployment target"

[MacPorts]

#53338: ogre @1.7.3_4 fails on Sierra -- "invalid deployment target"
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  Reporter:  starthal  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.5
Resolution:            |   Keywords:
      Port:  ogre      |
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Comment (by jmroot):

 The problem is the `-mmacosx-version-min=10.5`, which the build system
 must be adding itself somewhere.

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Ticket URL: <https://trac.macports.org/ticket/53338#comment:1>
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