[MacPorts] #44526: xxdiff: update to 4.0

[MacPorts]

#44526: xxdiff: update to 4.0
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  Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
      Type:  update       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  xxdiff       |
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Comment (by rjvbertin@…):

 Issue with how qmake generates the build rules; raised upstream a while
 ago already, nothing I can do about it.

 The Qt5 version isn't affected but I haven't verified if it builds against
 the current port:qt5-mac .

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Ticket URL: <https://trac.macports.org/ticket/44526#comment:14>
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