[MacPorts] #42742: update gmt to 4.5.12 and 5.1.1

[MacPorts]

#42742: update gmt to 4.5.12 and 5.1.1
----------------------------+---------------------------------
  Reporter:  florian@…      |      Owner:  ryandesign@…
      Type:  update         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:  haspatch maintainer
      Port:  gmt gmt4 gmt5  |
----------------------------+---------------------------------
Changes (by ryandesign@…):

 * owner:  macports-tickets@… => ryandesign@…
 * status:  new => assigned


Comment:

 Removed gmt in r117710.

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Ticket URL: <https://trac.macports.org/ticket/42742#comment:4>
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