[MacPorts] #70024: attica-qt5: add a Qt5-based version

[MacPorts]

#70024: attica-qt5: add a Qt5-based version
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 Reporter:  barracuda156  |      Owner:  (none)
     Type:  request       |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.9.3
 Keywords:                |       Port:  attica-qt5
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 To be clear, Qt4-based version is required, so we do not need to replace
 it, but rather add a subport.

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Ticket URL: <https://trac.macports.org/ticket/70024>
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