[MacPorts] #41408: xorg-cf-files/imake/xcb: Concat3() macro failure w/ clang with Xcode 5

[MacPorts]

#41408: xorg-cf-files/imake/xcb: Concat3() macro failure w/ clang with Xcode 5
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  Reporter:  ionic@…              |      Owner:  jmr@…
      Type:  defect               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.2.1
Resolution:                       |   Keywords:
      Port:  xorg-cf-files imake  |
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Comment (by jmr@…):

 Unfortunately this also requires a change to base: r125859

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Ticket URL: <https://trac.macports.org/ticket/41408#comment:8>
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