[MacPorts] #61810: certbot and subports set dependencies incorrectly with most variants

[MacPorts]

#61810: certbot and subports set dependencies incorrectly with most variants
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  Reporter:  jmroot   |      Owner:  Schamschula
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  certbot  |
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Comment (by jmroot):

 Variant bodies are executed after the portfile is executed. You need to
 either set the dependencies inside the variants as well, or use
 variant_isset to set python.default_version before setting the
 dependencies.

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Ticket URL: <https://trac.macports.org/ticket/61810#comment:3>
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