[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
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  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 reneeotten):

 okay, the Python version is fixed. But then there is the issue that it
 isn't doing reproducible builds since optional dependencies are not
 declared, but also not specifically switched off. And it's not using
 TheRightCompiler at some point in the build. That will need a bit more
 time to look at.

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Ticket URL: <https://trac.macports.org/ticket/62212#comment:7>
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