[MacPorts] #70376: KissXML: build failure with libxml2 2.12

[MacPorts]

#70376: KissXML: build failure with libxml2 2.12
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  Reporter:  i0ntempest  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:              |
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Comment (by i0ntempest):

 Upstream issue: https://github.com/robbiehanson/KissXML/issues/135

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Ticket URL: <https://trac.macports.org/ticket/70376#comment:1>
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