[MacPorts] #50123: GiNaC @1.6.5_0: update to 1.6.6

[MacPorts]

#50123: GiNaC @1.6.5_0: update to 1.6.6
---------------------------------+--------------------------------
 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:  haspatch maintainer  |       Port:  GiNaC
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 GiNaC has been updated to version 1.6.6. New this version:

 * Fix elusive bug in add::eval().
 * Several minor performance enhancements.

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Ticket URL: <https://trac.macports.org/ticket/50123>
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