[MacPorts] #47674: GiNaC @1.6.3: update to 1.6.4

[MacPorts]

#47674: GiNaC @1.6.3: update to 1.6.4
---------------------------------+--------------------------------
 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.3
 Keywords:  haspatch maintainer  |       Port:  GiNaC
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 GiNaC has been updated to version 1.6.4:
 {{{
 * Fix pow(+(...),2).expand() where the sum contained roots of rationals.
 * Various improvements for info(info_flags::nonnegative).
 * Make power::expand() (x*p)^c -> x^c * p^c, if p>0.
 * Fix normal() where nested functions occur multiple times.
 * Add optional explicit derivatives to functions and use it in abs(),
   imag_part(), real_part().
 * Evaluate abs(z)^(2n) -> z^n * conjugate(z)^n.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/47674>
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