[MacPorts] #63501: fluidsynth: Update to 2.2.x

[MacPorts]

#63501: fluidsynth: Update to 2.2.x
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  Reporter:  szhorvat    |      Owner:  (none)
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  fluidsynth  |
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Comment (by kakuhen):

 Hello, someone from the dosbox-staging project would like to add their
 software to MacPorts. Unfortunately, they rely on both the ABI and API of
 FluidSynth 2.2.x. To remedy the situation with existing ports, I was
 considering obsoleting fluidsynth in favor of fluidsynth-21, a version
 locked to 2.1.9, then we can revbump all dependents to use fluidsynth-21,
 while introducing a fluidsynth-22 port that installs the latest version
 (and obviously conflicts with fluidsynth-21). What do we think about this
 approach for the time being?

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Ticket URL: <https://trac.macports.org/ticket/63501#comment:5>
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