[MacPorts] #61858: libunistring: build fails due to failing configure checks

[MacPorts]

#61858: libunistring: build fails due to failing configure checks
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  Reporter:  chhil         |      Owner:  ci42
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:
      Port:  libunistring  |
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Comment (by ryandesign):

 Same issue reported in grep in #64135.

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Ticket URL: <https://trac.macports.org/ticket/61858#comment:22>
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