[MacPorts] #69683: vfkit @v0.5.1: build failure on x86_64 Big Sur

[MacPorts]

#69683: vfkit @v0.5.1: build failure on x86_64 Big Sur
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  Reporter:  cooljeanius  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.9.3
Resolution:               |   Keywords:  x86_64, bigsur
      Port:  vfkit        |
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Comment (by judaew):

 The issue appears to be that the code is trying to access the
 VZVirtioSoundDeviceInputStreamConfiguration that was introduced with macOS
 12+ while you are running macOS 11.

 https://developer.apple.com/documentation/virtualization/vzvirtiosounddeviceinputstreamconfiguration?language=objc

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Ticket URL: <https://trac.macports.org/ticket/69683#comment:3>
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