[MacPorts] #53952: qt55, qt56: use qt5's dist_subdir

[MacPorts]

#53952: qt55, qt56: use qt5's dist_subdir
-------------------------+---------------------------------
 Reporter:  ryandesign   |      Owner:  MarcusCalhoun-Lopez
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  qt55, qt56
-------------------------+---------------------------------
 Could qt55 and qt56 be changed to use the same `dist_subdir` that the qt5
 port uses? The qt55 and qt56 distfiles are already in the
 [https://distfiles.macports.org/qt5/ qt5 dir on the distfile mirrors] from
 back when the qt5 port was at those versions. This will fix the problem
 that users and our mirrors might have to mirror the same distfiles twice.

 {{{
 dist_subdir qt5
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53952>
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