[MacPorts] #33546: freeradius: add mysql variant

[MacPorts]

#33546: freeradius: add mysql variant
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 Reporter:  gvibe06@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement        |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  2.0.4                                
 Keywords:  haspatch           |        Port:  freeradius                           
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Comment(by gvibe06@…):

 Fixed patch with ${prefix} instead of hardcoded path.

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Ticket URL: <https://trac.macports.org/ticket/33546#comment:2>
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