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

[MacPorts]

#57412: clang ports: add runtime dependency on cctools
-------------------------------------------------+-------------------------
  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              |
-------------------------------------------------+-------------------------

Comment (by kencu):

 At present, the cctools on 10.7+ can handle things.

 Personally, as above [ticket:57412#comment:4] I'd add the dependency to
 all os versions, like we do with ld64, and cover all the future troubles
 we are soon likely to see related to this, but adding cctools to <= 10.6
 solves today's issue.

-- 
Ticket URL: <https://trac.macports.org/ticket/57412#comment:14>
MacPorts <https://www.macports.org/>
Ports system for macOS