[MacPorts] #57412: clang ports: add runtime dependency on cctools

[MacPorts]

#57412: clang ports: add runtime dependency on cctools
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  Reporter:  ryandesign                          |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  clang-5.0, clang-6.0, clang-7.0,    |
  clang-devel                                    |
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Comment (by cjones051073):

 cctools only declares dependencies on various llvm versions, not on the
 clang compilers derived from them. Should be tested but I think if you
 then only add cctools dependencies in clang, and not llvm, you should
 avoid circular dependencies...

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Ticket URL: <https://trac.macports.org/ticket/57412#comment:6>
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