[MacPorts] #57927: waf PortGroup: make the python version configurable

[MacPorts]

#57927: waf PortGroup: make the python version configurable
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  Reporter:  yan12125     |      Owner:  Ionic
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  mpv          |
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Comment (by raimue):

 Looking at the port group, the `waf.python` option is already
 configurable. Maybe the automatic build dependency on the chosen python
 version could be handled better. But what else would be required here?

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Ticket URL: <https://trac.macports.org/ticket/57927#comment:3>
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