[MacPorts] #42872: cmake PortGroup: don't add -I${prefix}/include to CXXFLAGS

[MacPorts]

#42872: cmake PortGroup: don't add -I${prefix}/include to CXXFLAGS
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  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  clhep    |
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Comment (by and.damore@…):

 I'm building neovim using mp-provided libraries and I have ''-I$prefix''
 before any other includes arg, this lead to error due to what clang
 interpret as implicit declaration.
 Is the position of ''-I$prefix'' in the makefile generated by cmake due to
 the issue described in this ticket?

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Ticket URL: <https://trac.macports.org/ticket/42872#comment:6>
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