[MacPorts] #67076: qpdf 11.3.0_0 fails to build on mavericks

[MacPorts]

#67076: qpdf 11.3.0_0 fails to build on mavericks
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  Reporter:  tehcog  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.8.1
Resolution:          |   Keywords:
      Port:  qpdf    |
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Comment (by kencu):

 those symbols appear to be available as of 10.13:

 https://github.com/llvm/llvm-
 project/blob/54225c457a336b1609c6d064b2b606a9238a28b9/libcxx/include/__availability#L187

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Ticket URL: <https://trac.macports.org/ticket/67076#comment:5>
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