[MacPorts] #33686: Update etch to 3.20.0

[MacPorts]

#33686: Update etch to 3.20.0
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 Reporter:  jheiss@…         |       Owner:  macports-tickets@…                   
     Type:  update           |      Status:  new                                  
 Priority:  Normal           |   Milestone:                                       
Component:  ports            |     Version:                                       
 Keywords:                   |        Port:  etch                                 
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 Patch for Portfile attached

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Ticket URL: <https://trac.macports.org/ticket/33686>
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