[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:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  hexchat
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 The default-enabled `sysinfo` plugin uses an API that is only available on
 10.10+ for getting the fine-grained OS X version number.

 We'll need to patch this around to support older releases as well.

 This goes ""after"" #52384.

 Just for review, if this looks good to you, I can commit it myself.

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