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

[MacPorts]

#50509: remove unnecessary openmp variant from llvm-3.8
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 Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
     Type:  enhancement            |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.4
 Keywords:                         |       Port:  llvm-3.8
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 The attached Portfile diff eliminates the unnecessary openmp variant now
 that the 3.8 branch cfe sources default to -fopenmp=libomp for -fopenmp.

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