[MacPorts] #72174: qt5-qtbase 5.15.15 fails on x86_64 Sequoia 15.4

[MacPorts]

#72174: qt5-qtbase 5.15.15 fails on x86_64 Sequoia 15.4
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  Reporter:  rcfa        |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.5
Resolution:              |   Keywords:
      Port:  qt5-qtbase  |
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Comment (by Schamschula):

 The first error is fixed by icu 77.1, by adding the missing header
 {{{<type_traits>}}} to {{{char16ptr.h}}}.

 However, qt5 seems to ignore all the attempts to pass -std=c++17 to
 {{{config.tests/icu/Makefile}}}. This causes all the templates not to be
 included.

 I added {{{QMAKE_CXXFLAGS+=-std=c++17}}} to the Portfile, which allowed
 the configure test for icu to pass.

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Ticket URL: <https://trac.macports.org/ticket/72174#comment:6>
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