[MacPorts] #52784: allow clang-3.9 support clang compilers to find the omp.h header from libomp package

[MacPorts]

#52784: allow clang-3.9 support clang compilers to find the omp.h header from
libomp package
------------------------+--------------------------------
  Reporter:  jwhowarth  |      Owner:  macports-tickets@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.4
Resolution:             |   Keywords:
      Port:  llvm-3.9   |
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Changes (by jwhowarth):

 * Attachment "Portfile.diff" added.

 Portfile diff to allow clang-3.9 compilers to find omp.h from libomp

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Ticket URL: <https://trac.macports.org/ticket/52784>
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