[MacPorts] #44197: launch4j: update to 3.4 and tidy portfile

[MacPorts]

#44197: launch4j: update to 3.4 and tidy portfile
-------------------------------+-------------------------
  Reporter:  steve+macports@…  |      Owner:  panayotis@…
      Type:  update            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  launch4j          |
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Changes (by mf2k@…):

 * cc: panayotis@… (removed)
 * owner:  macports-tickets@… => panayotis@…
 * version:  2.3.1 =>


Comment:

 [https://guide.macports.org/#development.patches Per the guidelines],
 please instead attach a unified diff of the Portfile so we can easily see
 what changes you are proposing. Please keep whitespace changes in a
 separate patch from functional changes.

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Ticket URL: <https://trac.macports.org/ticket/44197#comment:2>
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