[MacPorts] #51328: Provide git-svn as a standalone (sub)port

[MacPorts]

#51328: Provide git-svn as a standalone (sub)port
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  Reporter:  mojca        |      Owner:  ci42
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  git          |
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Comment (by cooljeanius):

 Related: #19405 (for another request to turn a git variant into a subport)

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Ticket URL: <https://trac.macports.org/ticket/51328#comment:2>
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