[MacPorts] #32017: GiNaC: update to 1.6.2

[MacPorts]

#32017: GiNaC: update to 1.6.2
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 Reporter:  ryandesign@…             |       Owner:  gwright@…           
     Type:  update                   |      Status:  new                 
 Priority:  Normal                   |   Milestone:                      
Component:  ports                    |     Version:                      
 Keywords:                           |        Port:  GiNaC               
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Comment(by david.ojeda@…):

 Here is a proposed Portfile for ginac-1.6.2
 I removed the clang check since this version compiles with clang

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Ticket URL: <https://trac.macports.org/ticket/32017#comment:2>
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