[MacPorts] #39296: evolution-data-server build failure

[MacPorts]

#39296: evolution-data-server build failure
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  Reporter:  macsforever2000@…      |      Owner:  jim@…
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.1.3
Resolution:                         |   Keywords:
      Port:  evolution-data-server  |
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Comment (by devans@…):

 This is due to API changes in libxml2 -- the specific elements of struct
 _xmlBuf are no longer public so you can not
 access them directly as in the past.  An API is provided instead. See
 attached patch which fixes the problem.

 @jim at geekdaily.org -- let me know if this is OK to commit.

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Ticket URL: <https://trac.macports.org/ticket/39296#comment:1>
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