[MacPorts] #20029: chicken: update to version 4.0.0

[MacPorts]

#20029: chicken: update to version 4.0.0
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 Reporter:  lkraider+ports@…          |       Owner:  macports-tickets@…                   
     Type:  update                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:  1.7.1                                
 Keywords:                            |        Port:  chicken                              
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 This patch updates the Chicken Scheme Portfile to build version 4.0.0 of
 the compiler.

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Ticket URL: <http://trac.macports.org/ticket/20029>
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