[MacPorts] #52385: hexchat: build failure on <10.10

[MacPorts]

#52385: hexchat: build failure on <10.10
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  Reporter:  ionic@…  |      Owner:  raimue@…
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:  fixed    |   Keywords:
      Port:  hexchat  |
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Comment (by ionic@…):

 `operatingSystemVersionString` is probably the better route to go, because
 it's not deprecated and in the end we want a human-readable string anyway.
 We'd have to convert it to a C string and put it under our control,
 though.

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Ticket URL: <https://trac.macports.org/ticket/52385#comment:9>
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