[MacPorts] #60344: FreeRDP 2.0.0 fails to build on <= 10.13

[MacPorts]

#60344: FreeRDP 2.0.0  fails to build on <= 10.13
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  Reporter:  ra1nb0w  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  FreeRDP  |
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Comment (by ryandesign):

 We should probably also bring the AVAudioBuffer issue to upstream's
 attention. We had a different build problem on 10.9 with 2.0.0-rc1 (see
 #55920) which upstream was willing to fix. Maybe they'll be willing to fix
 this one too.

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Ticket URL: <https://trac.macports.org/ticket/60344#comment:9>
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