[MacPorts] #47507: nghttp2: build failures on < 10.9 due to C++11 switch

[MacPorts]

#47507: nghttp2: build failures on < 10.9 due to C++11 switch
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  Reporter:  ionic@…  |      Owner:  mschamschula@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  nghttp2  |
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Comment (by mschamschula@…):

 Added code blocks for blacklisting compilers and requiring libc++.

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Ticket URL: <https://trac.macports.org/ticket/47507#comment:3>
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