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

[MacPorts]

#44197: launch4j: update to 3.4 and tidy portfile
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  Reporter:  steve+macports@…  |      Owner:  macports-tickets@…
      Type:  update            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.3.1
Resolution:                    |   Keywords:
      Port:  launch4j          |
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Comment (by steve+macports@…):

 Note that the copies of ld and windres bundled with launch4j have changed
 between versions 3.0.2 and 3.4.  They were previously ppc-only, and are
 now x86_64.  To get launch4j 3.0.2 to work on x86, I replaced those files
 with symlinks to the ones provided by i386-mingw32-binutils.  This
 workaround might also work for anyone wanting to use launch4j 3.4 on ppc.

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Ticket URL: <https://trac.macports.org/ticket/44197#comment:1>
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