[MacPorts] #47414: gwyddion: remove icu dependency

[MacPorts]

#47414: gwyddion: remove icu dependency
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 Reporter:  ryandesign@…  |      Owner:  rowue@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:                |       Port:  gwyddion
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 gwyddion declares a library dependency on port:icu but I can find no
 evidence that it's actually used. Maybe the dependency should be removed.

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Ticket URL: <https://trac.macports.org/ticket/47414>
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