[MacPorts] #71673: qt6-multimedia, qt64-multimedia, qt67-multimedia: /opt/local is hardcoded

[MacPorts]

#71673: qt6-multimedia, qt64-multimedia, qt67-multimedia: /opt/local is hardcoded
-------------------------+-------------------------------------------------
 Reporter:  ryandesign   |      Owner:  MarcusCalhoun-Lopez
     Type:  defect       |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  qt6-multimedia, qt64-multimedia,
                         |  qt67-multimedia
-------------------------+-------------------------------------------------
 `/opt/local` is hardcoded in the qt6-multimedia, qt64-multimedia, and
 qt67-multimedia ports. `${prefix}` should probably be used instead.

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Ticket URL: <https://trac.macports.org/ticket/71673>
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