[MacPorts] #62402: cmake: all python* variants depend on py39-sphinx* ports

[MacPorts]

#62402: cmake: all python* variants depend on py39-sphinx* ports
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  Reporter:  ballapete  |      Owner:  michaelld
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:  cmake      |
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Comment (by jmroot):

 The `python_branch` variable is set inside two loops which iterate through
 all the possible python variants, but there is no check for whether each
 variant is set, it's just set on every iteration. So the final value
 always ends up as whatever version is last in the list.

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Ticket URL: <https://trac.macports.org/ticket/62402#comment:11>
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