[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:
 Keywords:              |       Port:
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 Related: https://trac.macports.org/ticket/69428

 Downgrading to 2.11.6 will allow port to build.

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