[MacPorts] #41660: geda-gaf @1.6.2_0 (epoch 1): Update port to stable-1.8.2

[MacPorts]

#41660: geda-gaf @1.6.2_0 (epoch 1): Update port to stable-1.8.2
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  Reporter:  trm70@…   |      Owner:  emer@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  geda-gaf  |
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Comment (by emer@…):

 Ok, turns out I had a borked GMP install this whole time. Although it
 didn't show itself until I succesfully built geda-gaf. This patch looks
 good, I say we pull the trigger.

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Ticket URL: <https://trac.macports.org/ticket/41660#comment:15>
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