[MacPorts] #55756: sixs 2.1: new port for 6SV2.1

[MacPorts]

#55756: sixs 2.1: new port for 6SV2.1
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  Reporter:  ForTozs     |      Owner:
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:  maintainer
      Port:  sixs        |
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Comment (by ryandesign):

 Looks good. The `maintainers` line needs to change from `ForTozs` to
 `@ForTozs` since that is your GitHub handle, not your MacPorts handle. And
 instead of clearing `worksrcdir`, you should set `extract.mkdir yes`.

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Ticket URL: <https://trac.macports.org/ticket/55756#comment:1>
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