[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):

 Thanks.   The atommap C++ interface is not vital.  I'm not a C++ person.
 Is there a good test to see whether `std::scoped_lock` is supported?   If
 so, we can use normal locks instead or simply disable this part of the
 code and tests on compilers that do not support this.

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Ticket URL: <https://trac.macports.org/ticket/72023#comment:2>
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