[MacPorts] #38938: Update cadabra and modglue

[MacPorts]

#38938: Update cadabra and modglue
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  Reporter:  kasper.peeters@…  |      Owner:  larryv@…
      Type:  update            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  cadabra modglue   |
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Comment (by kasper.peeters@…):

 It needs the 'dvipng' program as well as the 'breqn.sty' style file; am
 not sure what is the minimal depends entry
 that gives me that.

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Ticket URL: <https://trac.macports.org/ticket/38938#comment:12>
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