[MacPorts] #45760: assimp: Add a noboost variant

[MacPorts]

#45760: assimp: Add a noboost variant
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  Reporter:  drew@…       |      Owner:  mmoll@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.2
Resolution:               |   Keywords:
      Port:  assimp       |
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Comment (by drew@…):

 3.0.1270 is perfectly fine until a fully functioning version is released.
 Just wanted to give a heads up that, unlike 3.1.1, its cmake configuration
 won't automatically set the workaround flag if boost isn't found.

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Ticket URL: <https://trac.macports.org/ticket/45760#comment:10>
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