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

[MacPorts]

#55756: sixs 2.1: new port for 6SV2.1
-------------------------+-----------------
  Reporter:  ForTozs     |      Owner:
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  sixs        |
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Comment (by mf2k):

 Comments:
  - Can openmaintainer be added?
  - Instead of using {{{distfiles}}}, use {{{distname}}}:
 {{{
 distname           6SV${version}
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55756#comment:3>
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