[MacPorts] #52978: qt5 applications not finding platforms plugins

[MacPorts]

#52978: qt5 applications not finding platforms plugins
-------------------------+-------------------
 Reporter:  dmarteau     |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.5
 Keywords:               |       Port:  qt5
-------------------------+-------------------
 Actually when compiling and running a qt5 application I need to set up
 explicitly the environnement variable QT_QPA_PLATFORM_PLUGIN_PATH or the
 application would not start with the error:

 ```
 Fatal: This application failed to start because it could not find or load
 the Qt platform plugin "cocoa"
 in "".
 ```

 It is not clear if this is a qt5 installation problem or if this should be
 handled by the application.

 Thanks

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Ticket URL: <https://trac.macports.org/ticket/52978>
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