[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:
Resolution:           |   Keywords:
      Port:  hexchat  |
----------------------+----------------------

Comment (by ionic@…):

 Just looked it up. More specifically, that version was also affected, BUT
 the `sysinfo` plugin wasn't built on OS X by default in 2.10.2, but only
 if `libpci` 3.0.0 or higher was installed (which probably could be
 classified as a bug and was later changed.)

 2.12.0 explicitly enabled it if '''OS X is detected''' or `libpci` 3.0.0
 or higher is installed.

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Ticket URL: <https://trac.macports.org/ticket/52385#comment:6>
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