[MacPorts] #68345: librdkafka @2.2.0_0: building fails with Clang fails due to unused -stdlib flag

[MacPorts]

#68345: librdkafka @2.2.0_0: building fails with Clang fails due to unused -stdlib
flag
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  Reporter:  zbaylin     |      Owner:  alexeyt820
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  librdkafka  |
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Comment (by cjones051073):

 The warning is valid, as the stdlib option only relates to C++ code ,
 where as above it is being passed to clang (not clang++) which is the C
 compiler.

 The bug is in the portfile, at the line you link above, as the option is
 being incorrectly appended to the ldflags, whereas it should instead be
 appended to the cxxflags.

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Ticket URL: <https://trac.macports.org/ticket/68345#comment:2>
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