[MacPorts] #62956: Update libxml2 to 2.9.12

[MacPorts]

#62956: Update libxml2 to 2.9.12
-------------------------+------------------------
  Reporter:  ghosthound  |      Owner:  ghosthound
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  libxml2     |
-------------------------+------------------------

Comment (by ghosthound):

 In [changeset:"6b5f6905141cb8e99e4a14c7a3602dfe195794a8/macports-ports"
 6b5f6905141cb8e99e4a14c7a3602dfe195794a8/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="6b5f6905141cb8e99e4a14c7a3602dfe195794a8"
 textproc/libxml2: revbump to 2.9.12
 resolves https://trac.macports.org/ticket/62956
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62956#comment:1>
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