[MacPorts] #40405: freeglut @2.8.0: update to 2.8.1

[MacPorts]

#40405: freeglut @2.8.0: update to 2.8.1
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  Reporter:  ralph@…   |      Owner:  jeremyhu@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  freeglut  |
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Comment (by jeremyhu@…):

 If I recall correctly, there was a reason that this doesn't "just work"
 for freeglut.

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Ticket URL: <https://trac.macports.org/ticket/40405#comment:2>
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