[MacPorts] #44526: xxdiff: update to 4.0

[MacPorts]

#44526: xxdiff: update to 4.0
--------------------------+--------------------------------
  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 khindenburg@…):

 I'm getting this w/ the qt4 version - I cloned your github to verify I had
 the correct patches.

 {{{
 ../xxdiff-4.0/src/resParser.cpp:40:10: fatal error: 'resParser_lex.h' file
 not found
 #include <resParser_lex.h>
 }}}

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Ticket URL: <https://trac.macports.org/ticket/44526#comment:13>
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