[MacPorts] #54129: llvm-4.0 build fails due to libtool error on SnowLeopard when built with clang-3.9, but succeeds when built with clang-3.7

[MacPorts]

#54129: llvm-4.0 build fails due to libtool error on SnowLeopard when built with
clang-3.9, but succeeds when built with clang-3.7
-----------------------+----------------------
  Reporter:  kencu     |      Owner:  jeremyhu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  llvm-4.0  |
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Comment (by jeremyhu):

 Please give this a try for the change in base:

 https://github.com/jeremyhu/macports-
 base/commit/90eb1ae7903e9b24fa47c8e2a2adef3e50e69fb3

 As for `-DCMAKE_LIBTOOL=${prefix}/bin/libtool`, IMO, that should be
 default.  We should fix how CMAKE_LIBTOOL gets discovered.

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Ticket URL: <https://trac.macports.org/ticket/54129#comment:19>
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