[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@…):

 Uploaded the modified Portfile diff. I've added 2 patchfiles, one to
 correct a minor issue in the parser yacc source, and one to add a few
 keyboard accelerators (which I'd defined through the SystemPreferences
 before with a non-MacPorts build of the same source).

 Building the package on Linux, I discovered that resParser.y must be
 adapted for use with bison 3.0x . I don't know if/when MacPorts will
 upgrade bison to the v3 series, but when that happens a patch must be
 found. I am not familiar with these tools, sadly, or I'd do it right now.

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Ticket URL: <https://trac.macports.org/ticket/44526#comment:8>
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