[MacPorts] #47894: rb-rmagick: update to 2.16.0 (was: rb-rmagick: update to 2.15.0)

[MacPorts]

#47894: rb-rmagick: update to 2.16.0
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  rb-rmagick    |
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Comment (by ryandesign@…):

 rubyforge.org is still down. rb-rmagick is back to its normal
 https://github.com/rmagick/rmagick home. Version 2.16.0 has been released,
 but I don't know how to build it; it no longer includes a setup.rb script.

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Ticket URL: <https://trac.macports.org/ticket/47894#comment:1>
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