[MacPorts] #62048: portmidi: update to r234

[MacPorts]

#62048: portmidi: update to r234
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 Reporter:  mascguy  |      Owner:  mascguy
     Type:  update   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  portmidi
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 Our version of `portmidi` is very out-of-date, and needs to be updated.

 As part of this upgrade, I'll also tackle the build failures on Big Sur:

 issue:41610

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Ticket URL: <https://trac.macports.org/ticket/62048>
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