[MacPorts] #62212: spice-gtk: Meson build fails with "Python module six not found" with Python 3.9

[MacPorts]

#62212: spice-gtk: Meson build fails with "Python module six not found" with Python
3.9
------------------------------+----------------------
  Reporter:  rseichter        |      Owner:  danchr
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.4
Resolution:                   |   Keywords:
      Port:  spice-gtk meson  |
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Comment (by grumpybozo):

 Workaround tactics to try, towards accommodating/tricking both meson and
 spice:

 * Install ''**both**'' python3_select and python_select use ''**both**''
 to select python38
 * Install ''**both**'' py38-six AND py39-six.

-- 
Ticket URL: <https://trac.macports.org/ticket/62212#comment:4>
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