[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-3.9, clang-4.0, clang-5.0,    |
  clang-6.0, clang-7.0, clang-devel              |
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Comment (by ryandesign):

 From what I can tell, Xcode `ranlib` on Lion and newer is new enough. So I
 would probably only add the cctools lib dependency when `[vercmp
 $xcodeversion 4] < 0`.

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Ticket URL: <https://trac.macports.org/ticket/57412#comment:11>
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