[MacPorts] #58821: cmake, clang-8.0: circular dependency on older systems

[MacPorts]

#58821: cmake, clang-8.0: circular dependency on older systems
--------------------+-----------------------------
 Reporter:  jmroot  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.5.99
 Keywords:  libcxx  |       Port:  cmake clang-8.0
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 On older systems such as 10.6, when using current master and
 cxx_stdlib=libc++, cmake and clang-8.0 depend on each other. This will
 need to be resolved to allow making libc++ the default on 10.6 through
 10.8.

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Ticket URL: <https://trac.macports.org/ticket/58821>
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