[MacPorts] #58225: uhd: Add python37 variant

[MacPorts]

#58225: uhd: Add python37 variant
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  Reporter:  mf2k         |      Owner:  michaelld
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  uhd          |
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Comment (by michaelld):

 Makes sense to me too.

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Ticket URL: <https://trac.macports.org/ticket/58225#comment:3>
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