[MacPorts] #31016: bzflag: update to 2.4.0

[MacPorts]

#31016: bzflag: update to 2.4.0
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  Reporter:  ryandesign@…  |      Owner:  phw@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  bzflag        |
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Comment (by petr@…):

 phw retired, #45339.

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Ticket URL: <https://trac.macports.org/ticket/31016#comment:1>
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