[MacPorts] #31545: port chicken update to version 4.7.0

[MacPorts]

#31545: port chicken update to version 4.7.0
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 Reporter:  rlonstein@…          |       Owner:  macports-tickets@…                   
     Type:  update               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  2.0.3                                
 Keywords:                       |        Port:  chicken                              
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 Update Chicken Scheme to 4.7.0

 Appending patch to portfile and updated Makefile patch

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Ticket URL: <https://trac.macports.org/ticket/31545>
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