[MacPorts] #60475: libproxy: Add python38 variant

[MacPorts]

#60475: libproxy: Add python38 variant
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 Reporter:  mf2k    |      Owner:  dbevans
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libproxy
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 Can a {{{python38}}} variant be added to libproxy?

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Ticket URL: <https://trac.macports.org/ticket/60475>
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