[MacPorts] #43939: libpng: pngconf.h:366:52: error: token is not a valid binary operator in a preprocessor subexpression

[MacPorts]

#43939: libpng: pngconf.h:366:52: error: token is not a valid binary operator in a
preprocessor subexpression
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  Reporter:  macports@…  |      Owner:  ryandesign@…
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.0
Resolution:              |   Keywords:
      Port:  libpng      |
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Comment (by devans@…):

 OK, if you have nothing better to do and if you can narrow the version of
 clang that is failing, go ahead and update the blacklist clang version.
 However, as things stand, the problem has been fixed so I would just call
 it fixed and get on with other things.

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Ticket URL: <https://trac.macports.org/ticket/43939#comment:12>
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