[MacPorts] #43519: msgpack: upgrade to 0.5.8

[MacPorts]

#43519: msgpack: upgrade to 0.5.8
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 Reporter:  nickolas.fotopoulos@…  |      Owner:  macports-tickets@…
     Type:  update                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.2.1
 Keywords:                         |       Port:  msgpack
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 If a maintainer has a moment, I'd like to request a bump to 0.5.8. It has
 the bin type that I'm using for my application. This a pretty easy bump,
 as there are a few new types (bin 8/16/32 and str 8) and some bug fixes
 but not a lot else. I've attached an updated Portfile that appears to work
 with the source tarball downloaded from the official site:
 https://github.com/msgpack/msgpack-c/releases

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