[MacPorts] #18401: Upgrade asymptote port to version 1.61

[MacPorts]

#18401: Upgrade asymptote port to version 1.61
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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@…):

 Since I created the ticket a new version of asymptote has been released,
 so I replaced the diff with one for the newest version (although this does
 make title of the ticket inaccurate).

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Ticket URL: <http://trac.macports.org/ticket/18401#comment:1>
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