[MacPorts] #72023: swi-prolog @9.2.9: Patch idea for macOS 10.11.6

[MacPorts]

#72023: swi-prolog @9.2.9: Patch idea for macOS 10.11.6
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  Reporter:  kogule       |      Owner:  JanWielemaker
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.10.5
Resolution:               |   Keywords:
      Port:  swi-prolog   |
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Comment (by JanWielemaker):

 According to https://en.cppreference.com/w/cpp/thread/shared_lock,
 `std::shared_lock` requires at least C++-14.  The CMakeFile sets the
 standard to 17.  Why is this failing than?   Which c++ version is
 clang++-mp-16?   Or is the issue that clang++-mp-16 uses the system C++
 library?   That seems wrong to me, no?

 We surely do not want to add the C++ library to linking libswipl.dll as
 SWI-Prolog itself is free of C++.

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Ticket URL: <https://trac.macports.org/ticket/72023#comment:3>
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