[MacPorts] #47025: poppler: add Qt5 subport and optional test support.

[MacPorts]

#47025: poppler: add Qt5 subport and optional test support.
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  Reporter:  rjvbertin@…  |      Owner:  devans@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  poppler      |
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Comment (by rjvbertin@…):

 Whether the QT4 one is necessary will depend on how things are set up,
 i.e. if you have a `moc` in your path and what version that is. Rather
 than second guess or impose additional dependencies (that aren't yet
 incorporated in MacPorts) I preferred to use the easiest and most explicit
 way poppler provides to point the build to the correct moc.

 Example: I have port:qtchooser installed, and configured such that
 ${prefix}/bin/{qmake,moc,etc} correspond to the Qt4 versions. So
 specifying MOCQT4 is redundant, but you get interesting results when the
 Qt5 build stumbles on and uses the Qt4 moc. (And that happens only quite
 far into the build.)

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Ticket URL: <https://trac.macports.org/ticket/47025#comment:17>
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