[MacPorts] #57712: pulseaudio: using incorrect sysroot

[MacPorts]

#57712: pulseaudio: using incorrect sysroot
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  Reporter:  sgrewe      |      Owner:  Ionic
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:  mojave
      Port:  pulseaudio  |
-------------------------+----------------------

Comment (by kencu):

 So Stefan, it looks like if instead of deleting the **contents** of
 `/usr/include`, if just delete `/usr/include` completely, you should be
 OK.

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Ticket URL: <https://trac.macports.org/ticket/57712#comment:7>
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