[MacPorts] #36375: GiNaC: update tp 1.6.2

[MacPorts]

#36375: GiNaC: update tp 1.6.2
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 Reporter:  l.digaspero@…  |      Owner:  macports-tickets@…
     Type:  update         |     Status:  new
 Priority:  Normal         |  Milestone:  MacPorts Future
Component:  ports          |    Version:  2.1.2
 Keywords:                 |       Port:
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 I am aware this is a duplicate issue, but the current portfile refers to a
 version of two years ago!

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Ticket URL: <https://trac.macports.org/ticket/36375>
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