[MacPorts] #20770: opal: should use ${configure.cxx}

[MacPorts]

#20770: opal: should use ${configure.cxx}
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  snc@…           
     Type:  defect                   |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  1.7.1           
 Keywords:                           |        Port:  opal            
-------------------------------------+--------------------------------------
 opal isn't UsingTheRightCompiler; it's using "g++" but should be using
 ${configure.cxx}.

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Ticket URL: <http://trac.macports.org/ticket/20770>
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