[MacPorts] #57106: multimarkdown @6.3.2: new release 6.4.0

[MacPorts]

#57106: multimarkdown @6.3.2: new release 6.4.0
-------------------------+---------------------------
 Reporter:  jlargentaye  |      Owner:  (none)
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  multimarkdown
-------------------------+---------------------------
 https://github.com/fletcher/MultiMarkdown-6/releases/tag/6.4.0

 Fixes some important regressions since multimarkdown-4, such as "%" in
 code-spans breaking LaTeX output, and also adds exporting (through "latex"
 var in CMakeLists.txt) updated LaTeX support files so these no longer need
 to be distributed separately

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Ticket URL: <https://trac.macports.org/ticket/57106>
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