[MacPorts] #70748: icu: does not install on MacOS15

[MacPorts]

#70748: icu: does not install on MacOS15
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  Reporter:  cfranzke72  |      Owner:  catap
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.1
Resolution:              |   Keywords:  sequoia
      Port:  icu         |
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Comment (by ryandesign):

 An inability to find system headers seems to be a problem affecting many
 ports on macOS 15 and/or Xcode 16; see #70750.

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Ticket URL: <https://trac.macports.org/ticket/70748#comment:3>
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