[MacPorts] #58493: cctools: using clang < 5.0 as default assembler generates assembly errors in some cases

[MacPorts]

#58493: cctools: using clang < 5.0 as default assembler generates assembly errors
in some cases
----------------------+----------------------
  Reporter:  kencu    |      Owner:  jeremyhu
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cctools  |
----------------------+----------------------

Comment (by kencu):

 My worry with your plan is there will be no way to know which assembler
 was used in a given build. If that's true, triaging tickets will be
 difficult.

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Ticket URL: <https://trac.macports.org/ticket/58493#comment:17>
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