[MacPorts] #70207: c-ares @1.30.0_0: fatal error: 'os/availability.h' file not found

[MacPorts]

#70207: c-ares @1.30.0_0: fatal error: 'os/availability.h' file not found
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  Reporter:              |      Owner:  tobypeterson
  sambthompson           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.9.3
Resolution:              |   Keywords:  mountainlion mavericks yosemite
      Port:  c-ares      |  elcapitan
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Comment (by tobypeterson):

 Alternatively we'll just have to stick older OS versions on 1.28.1, but
 that isn't ideal considering that c-ares does have the occasional CVE.
 (Most recent one was just this February.)

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Ticket URL: <https://trac.macports.org/ticket/70207#comment:9>
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