[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 ryandesign@…):

 Some observations:

  * One should not both declare "`use_configure no`" and define a
 "`configure`" block.
  * Do you really need to override the configure phase to run `qmake`? The
 point of the qmake 1.0 portgroup is to automate that for you.
  * One should not "`system "cd ...; ..."`"; one should instead "`system -W
 ... "..."`".
  * "`file copy`" can be shortened to "`copy`" and "`file delete`" can be
 shortened to "`delete`".
  * Is there a reason why the documentation needs to be moved to a doc
 variant? Variants should be added sparingly and when absolutely necessary.

-- 
Ticket URL: <https://trac.macports.org/ticket/44526#comment:5>
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