[MacPorts] #41408: xorg-cf-files/imake/xcb: Concat3() macro failure w/ clang on 10.9

[MacPorts]

#41408: xorg-cf-files/imake/xcb: Concat3() macro failure w/ clang on 10.9
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 Reporter:  ionic@…                            |      Owner:  macports-
     Type:  defect                             |  tickets@…
 Priority:  Normal                             |     Status:  new
Component:  ports                              |  Milestone:
 Keywords:  xcb xorg-cf-files imake Mavericks  |    Version:  2.2.1
                                               |       Port:  xorg-cf-files
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 Now that Mavericks dropped llvm-gcc support, we're left with clang not
 supporting "traditional CPP", thus making the Concat3 macro fail.

 This bug came by when compiling xcb, but is actually triggered by xorg-cf-
 files, thus setting port to that value.

 Also see #31504

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