[MacPorts] #56433: update gmt4 to 4.5.17

[MacPorts]

#56433: update gmt4 to 4.5.17
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  Reporter:  fvaccari  |      Owner:  (none)
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.3
Resolution:            |   Keywords:
      Port:  gmt4      |
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Comment (by pmetzger):

 FYI, you may find that the update happens quicker if you submit a GitHub
 pull request for the needed change to the Portfile.

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Ticket URL: <https://trac.macports.org/ticket/56433#comment:1>
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