[MacPorts] #53995: nmap @7.40 fails to build with libc++

[MacPorts]

#53995: nmap @7.40 fails to build with libc++
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  Reporter:  1-61803  |      Owner:
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  nmap     |
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Comment (by ryandesign):

 This build system appears to have forgotten that the CXXFLAGS need to be
 passed not just when calling the C++ compiler as a compiler, but also when
 calling it as a linker to link C++ code.

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Ticket URL: <https://trac.macports.org/ticket/53995#comment:1>
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