[MacPorts] #47837: port:exiv2 upgrade (also addresses a current crash)

[MacPorts]

#47837: port:exiv2 upgrade (also addresses a current crash)
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  Reporter:  rjvbertin@…  |      Owner:  tcurdt@…
      Type:  update       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  exiv2        |
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Comment (by larryv@…):

 Why is the `subversion` port necessary? What’s wrong with Xcode’s
 Subversion?

 And please remove the `if {[file exists ${filespath}/${name}-svn/.svn]}`
 testing detritus.

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Ticket URL: <https://trac.macports.org/ticket/47837#comment:5>
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