[MacPorts] #69998: msgpack1: install in a dedicated prefix to avoid conflicts with msgpack, msgpack-c and msgpack-cpp

[MacPorts]

#69998: msgpack1: install in a dedicated prefix to avoid conflicts with msgpack,
msgpack-c and msgpack-cpp
-------------------------------------------------+-------------------------
  Reporter:  barracuda156                        |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.9.3
Resolution:                                      |   Keywords:
      Port:  msgpack1, msgpack-c, msgpack-cpp,   |
  msgpack                                        |
-------------------------------------------------+-------------------------

Comment (by reneeotten):

 by now most ports should hopefully have transitioned from these old
 {{{msgpack}}} versions. It doesn't look like there is any that depends on
 {{{msgpack1}}} (or some of the other ones); so I would suggest to just get
 rid of them instead of spending time and effort.

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Ticket URL: <https://trac.macports.org/ticket/69998#comment:2>
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