[MacPorts] #17474: Update ruby19 -> preview2

[MacPorts]

#17474: Update ruby19 -> preview2
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 Reporter:  neufelry@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement         |      Status:  new                                  
 Priority:  Normal              |   Milestone:  Port Updates                         
Component:  ports               |     Version:  1.6.0                                
 Keywords:                      |        Port:  ruby19                               
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 I've updated the ruby19 Portfile to build the newly released "preview2"
 (as opposed to the old "preview1"). I've made no changes other than the
 version and md5 checksum.

 Diff attached.

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Ticket URL: <http://trac.macports.org/ticket/17474>
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