[MacPorts] #59918: stimfit: don't choose conflicting default variant

[MacPorts]

#59918: stimfit: don't choose conflicting default variant
--------------------+------------------------
 Reporter:  jmroot  |      Owner:  neurodroid
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  stimfit
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 {{{
 % port info stimfit +biosig
 Error: stimfit: Variant biosig conflicts with biosiglite
 Error: Unable to open port: Error evaluating variants
 }}}
 biosiglite should only be on by default if biosig is not set.

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Ticket URL: <https://trac.macports.org/ticket/59918>
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