[MacPorts] #68559: openbabel build fails to set correct C++ standard: C++14 is required due to Eigen

[MacPorts]

#68559: openbabel build fails to set correct C++ standard: C++14 is required due to
Eigen
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  Reporter:  barracuda156  |      Owner:  reneeotten
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  openbabel     |
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Comment (by barracuda156):

 So it looks like `gui` is not default, so no wxWidgets should have been
 used, but the linking flag is still passed.

 Also `wxWidgets-3.2` is definitely broken on old systems atm; if it
 support 2.8 or 3.0, it should be preferred. (May not save PowerPC, as of
 now, but should help older Intel.)

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Ticket URL: <https://trac.macports.org/ticket/68559#comment:9>
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