[MacPorts] #52384: hexchat: uses installed headers opportunistically

[MacPorts]

#52384: hexchat: uses installed headers opportunistically
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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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 `hexchat` uses the already installed system headers, if possible.

 Trace mode helps in such cases, but let's fix this opportunistic usage
 anyway.

 This patch should be applied before #XXX.

 Just for review, if you're okay with it I can apply it myself.

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Ticket URL: <https://trac.macports.org/ticket/52384>
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