[MacPorts] #56093: compiler-blacklist-versions: simplify clang blacklisting by associating Apple clang versions with macports-clang versions

[MacPorts]

#56093: compiler-blacklist-versions: simplify clang blacklisting by associating
Apple clang versions with macports-clang versions
--------------------------+-----------------
  Reporter:  kencu        |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  clang        |
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Comment (by ryandesign):

 That sounds reasonable. So then we just need to have a method for
 determining which clang version corresponds to the Apple LLVM build
 numbers of Xcode 7 and later.

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Ticket URL: <https://trac.macports.org/ticket/56093#comment:4>
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