[MacPorts] #69597: libcryptopp is broken on x86 due to using libstdc++

[MacPorts]

#69597: libcryptopp is broken on x86 due to using libstdc++
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  Reporter:  barracuda156  |      Owner:  barracuda156
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.1
Resolution:                |   Keywords:  mountainlion, x86_64
      Port:  libcryptopp   |
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Comment (by ryandesign):

 MacPorts already adds `-stdlib=libc++` to cxxflags so this suggests the
 build is ignoring our cxxflags. The buildbot logs have already expired so
 please attach your main.log file to see if we can spot any other
 confirmation of that.

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Ticket URL: <https://trac.macports.org/ticket/69597#comment:4>
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