[MacPorts] #42151: stimfit @0.13.8: update 0.13.9

[MacPorts]

#42151: stimfit @0.13.8: update 0.13.9
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 Reporter:  christsc@…           |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:  haspatch maintainer  |       Port:  stimfit
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 Adds biosig support; pending ticket #42147
 Also fixes deprecated Google code download site.
 Portfile patch attached. I'm the maintainer, but I don't have commit
 rights.

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Ticket URL: <https://trac.macports.org/ticket/42151>
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