[MacPorts] #20189: rb-rake update to 0.8.7

[MacPorts]

#20189: rb-rake update to 0.8.7
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 Reporter:  blb@…             |       Owner:  rcavanaugh@…        
     Type:  update            |      Status:  new                 
 Priority:  Normal            |   Milestone:                      
Component:  ports             |     Version:  1.8.0               
 Keywords:                    |        Port:  rb-rake             
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 Attached is a simple patch to update ruby/rb-rake to version 0.8.7.

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Ticket URL: <http://trac.macports.org/ticket/20189>
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