[MacPorts] #54135: clang-4.0 error building software on 10.6 (or less) due to #include_next <float.h>

[MacPorts]

#54135: clang-4.0 error building software on 10.6 (or less) due to #include_next
<float.h>
------------------------+---------------------------------------
  Reporter:  kencu      |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  snowleopard leopard tiger
      Port:  clang-4.0  |
------------------------+---------------------------------------

Comment (by mojca):

 In case Jeremy has no time to commit this, one of us could, even though
 I'm sadly unable to do such extensive testing as Jeremy usually does. I
 desperately need a working clang-4.0 compiler on 10.6 :)

 From what I understand Jeremy suggested to completely revert the patch.
 That is: make the patch unconditional (not just on 10.6). Someone may
 submit a PR, even though I doubt that the build would actually finish in
 time.

 Does this need a revbump or not?

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Ticket URL: <https://trac.macports.org/ticket/54135#comment:11>
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