[MacPorts] #49714: gmt5 @5.1.2_1: update to 5.2.1

[MacPorts]

#49714: gmt5 @5.1.2_1: update to 5.2.1
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  Reporter:  florian@…  |      Owner:  macports-tickets@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch maintainer
      Port:  gmt5       |
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Comment (by ryandesign@…):

 Listing MacPorts GCC ports as fallbacks always makes me uncomfortable, but
 if those are the only compilers that will work for the openmp variant: is
 there any particular reason why you omitted macports-gcc-4.9 from the
 list?

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Ticket URL: <https://trac.macports.org/ticket/49714#comment:1>
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