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

[MacPorts]

#70376: KissXML: build failure with libxml2 2.12
-------------------------+----------------------
  Reporter:  i0ntempest  |      Owner:  Janosch
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  KissXML     |
-------------------------+----------------------
Changes (by jmroot):

 * owner:  (none) => Janosch
 * cc: Janosch (removed)
 * status:  new => assigned
 * port:   => KissXML


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Ticket URL: <https://trac.macports.org/ticket/70376#comment:2>
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