[MacPorts] #68991: exiv2: Update to 0.28.1

[MacPorts]

#68991: exiv2: Update to 0.28.1
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  Reporter:  alchymy  |      Owner:  ryandesign
      Type:  update   |     Status:  accepted
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  exiv2    |
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Comment (by ryandesign):

 Replying to [comment:12 mascguy]:
 > But simply maintaining a segregated version for older ports would
 eliminate all of that. Why not just do that, and save yourself the
 headaches?

 Not saying we should or shouldn't do it, but using a segregated library
 introduces all new headaches of needing to teach each port, in its own
 unique way, how to located the segregated library.

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Ticket URL: <https://trac.macports.org/ticket/68991#comment:15>
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