[MacPorts] #50709: port:opencv+qt4 uses Qt5 if both Qt4 and Qt5 are installed

[MacPorts]

#50709: port:opencv+qt4 uses Qt5 if both Qt4 and Qt5 are installed
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  Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:  opencv       |
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Comment (by rjvbertin@…):

 the attached patchfile contains the above change, plus correction of an
 error in opencv.pc for the +qt4 variant .

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Ticket URL: <https://trac.macports.org/ticket/50709#comment:3>
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