[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@…):

 I see the latter ticket has portfiles for building bison 2.7 and 3.0, but
 they haven't yet made it to MacPorts?

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Ticket URL: <https://trac.macports.org/ticket/44526#comment:10>
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