[MacPorts] #33036: sdcc update port to 3.1.0

[MacPorts]

#33036: sdcc update port to 3.1.0
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 Reporter:  lara.dougan@…             |       Owner:  macports-tickets@…                   
     Type:  update                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:  2.0.3                                
 Keywords:  haspatch                  |        Port:  sdcc                                 
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 Hi. Here is a patch to update SDCC to version 3.1.0.

 I also removed avr and x51 then added variants for them because they are
 unsupported by SDCC now.

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Ticket URL: <https://trac.macports.org/ticket/33036>
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