[MacPorts] #62982: qt6: add port(s) for new Qt version 6

[MacPorts]

#62982: qt6: add port(s) for new Qt version 6
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  Reporter:  JDLH         |      Owner:  (none)
      Type:  request      |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:  qt6 qt5 qt4  |
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Comment (by jhoyt4):

 I started putting together a PR for qt6.  Happy to get another set of eyes
 on the Portfile.  Honestly, any and all help is welcome.

 Here's the PR - [https://github.com/macports/macports-ports/pull/12676]

 Warning - this is currently untested, but compiles on macOS 11.6 intel.

 I'll certainly test more on intel and arm64 when I have a bit more time.

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Ticket URL: <https://trac.macports.org/ticket/62982#comment:4>
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