[MacPorts] #59342: cctools @921_3+llvm70: uses incorrect SDK taken from llvm-config-mp-7.0

[MacPorts]

#59342: cctools @921_3+llvm70: uses incorrect SDK taken from llvm-config-mp-7.0
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  Reporter:  thomasrussellmurphy  |      Owner:  jeremyhu
      Type:  defect               |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.6.1
Resolution:                       |   Keywords:
      Port:  cctools llvm-7.0     |
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Comment (by EJFielding):

 I was going to open a new ticket but found this one with exactly the same
 problem. I am attaching my "main.log" file also in case it helps.

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Ticket URL: <https://trac.macports.org/ticket/59342#comment:4>
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