[MacPorts] #19104: Upgrade asymptote port to version 1.68

[MacPorts]

#19104: Upgrade asymptote port to version 1.68
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 Reporter:  loshea@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:  Port Updates                         
Component:  ports             |     Version:  1.7.0                                
 Keywords:                    |        Port:  asymptote                            
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Comment(by loshea@…):

 Note that current diff upgrades the port to 1.69 (rather than 1.68, as the
 title claims).

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Ticket URL: <http://trac.macports.org/ticket/19104#comment:1>
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