[MacPorts] #43519: msgpack: upgrade to 0.5.8

[MacPorts]

#43519: msgpack: upgrade to 0.5.8
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  Reporter:  nickolas.fotopoulos@…  |      Owner:  hum@…
      Type:  update                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.2.1
Resolution:                         |   Keywords:  haspatch
      Port:  msgpack                |
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Comment (by nickolas.fotopoulos@…):

 Thanks for the pointers. I'll try to remember those in the future.

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Ticket URL: <https://trac.macports.org/ticket/43519#comment:2>
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