[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:  ciserlohn@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  git
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 I just noticed that for `git +svn` I have to recompile the complete git.
 It seems that all git-svn does is add one command and a few dependencies.

 It might be nice to provide that in a subport rather than asking users to
 recompile git. (Or at least make `+svn` a default variant.)

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