[MacPorts] #50509: llvm-3.8: remove unnecessary openmp variant

[MacPorts]

#50509: llvm-3.8: remove unnecessary openmp variant
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  Reporter:  howarth.at.macports@…  |      Owner:  jeremyhu@…
      Type:  enhancement            |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.4
Resolution:                         |   Keywords:  haspatch
      Port:  llvm-3.8               |
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Comment (by jeremyhu@…):

 I'm going to just wait for https://llvm.org/bugs/show_bug.cgi?id=26393 to
 land and then pull in the changes from upstream.

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Ticket URL: <https://trac.macports.org/ticket/50509#comment:4>
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