[MacPorts] #34697: use ${frameworks_dir} instead of ${prefix}/Library/Frameworks

[MacPorts]

#34697: use ${frameworks_dir} instead of ${prefix}/Library/Frameworks
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 Reporter:  mojca.miklavec.lists@…          |       Owner:  macports-tickets@…                   
     Type:  defect                          |      Status:  new                                  
 Priority:  Low                             |   Milestone:                                       
Component:  ports                           |     Version:  2.1.1                                
 Keywords:                                  |        Port:  plplot                               
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 I'm attaching a trivial patch to replace `${prefix}/Library/Frameworks`
 with `${frameworks_dir}`. For 99.9% users there is no difference anyway,
 but it might make sense to fix it nonetheless.

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Ticket URL: <https://trac.macports.org/ticket/34697>
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