[MacPorts] #68622: lttoolbox: update to 3.7.1

[MacPorts]

#68622: lttoolbox: update to 3.7.1
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 Reporter:  contextnerror  |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:                 |       Port:  lttoolbox
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 The project has moved to github. https://github.com/apertium/lttoolbox \\
 This update would be needed to enable updating apertium to 3.8.3. \\
 utfcpp is no longer bundled as of 3.6.0 and will need to be supplied
 separately, I don't think we have a port for it.

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Ticket URL: <https://trac.macports.org/ticket/68622>
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