[MacPorts] #50966: Qt5 PortGroup files; preparing for port:qt5-kde and the KF5 port family

[MacPorts]

#50966: Qt5 PortGroup files; preparing for port:qt5-kde and the KF5 port family
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  Reporter:  rjvbertin@…   |      Owner:  macports-tickets@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.4
Resolution:                |   Keywords:
      Port:  qt5, qt5-kde  |
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Comment (by rjvbertin@…):

 I forgot: my qt5-kde port uses a slightly different qmake5 PortGroup too;
 in this case it's easy enough to provide both flavours in a single file.

 Note also the conditional use of ${configure.cxx_stdlib} (IOW, don't use
 it if empty).

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Ticket URL: <https://trac.macports.org/ticket/50966#comment:1>
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