[MacPorts] #58908: port at 2.5.99 does not build clang-8.0.0_1; port at 2.5.4 does build it and so does the buildbot

[MacPorts]

#58908: port at 2.5.99 does not build clang-8.0.0_1; port at 2.5.4 does build it and so
does the buildbot
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  Reporter:  snowflake  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:             |
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Changes (by snowflake):

 * Attachment "raw.log" added.

 raw log of the errors, generated 1/sep/2019

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Ticket URL: <https://trac.macports.org/ticket/58908>
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