[MacPorts] #63738: auto-multiple-choice/auto-multiple-choice-devel: fix build failures for older macOS releases, or set known_fail

[MacPorts]

#63738: auto-multiple-choice/auto-multiple-choice-devel: fix build failures for
older macOS releases, or set known_fail
-------------------------------------------------+-------------------------
  Reporter:  mascguy                             |      Owner:  nortcele
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.7.1
Resolution:                                      |   Keywords:
      Port:  auto-multiple-choice auto-          |
  multiple-choice-devel                          |
-------------------------------------------------+-------------------------

Comment (by mascguy):

 Replying to [comment:1 evanmiller]:
 > Have you tried {{{compiler.cxx_standard 2011}}}?

 That would certainly be preferable to blacklisting!

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Ticket URL: <https://trac.macports.org/ticket/63738#comment:2>
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