[MacPorts] #48759: llvm-3.7: Update to release and add +openmp

[MacPorts]

#48759: llvm-3.7: Update to release and add +openmp
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  Reporter:  eborisch@…   |      Owner:  jeremyhu@…
      Type:  enhancement  |     Status:  reopened
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.3
Resolution:               |   Keywords:
      Port:  clang-3.7    |
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Comment (by howarth.at.macports@…):

 This issue still exists in Xcode 7.0.1. Wouldn't a possible fix be to
 install the symlinks for libc++.dylib and libc++abi.dylib in
 {prefix}/local/lib pointing at the copies in /usr/lib when Xcode 7 or
 later is installed?

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Ticket URL: <https://trac.macports.org/ticket/48759#comment:8>
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