[MacPorts] #44299: iperf: Update to version 3.0.11

[MacPorts]

#44299: iperf: Update to version 3.0.11
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  Reporter:  smith.kennedy+macports@…  |      Owner:  macports-tickets@…
      Type:  update                    |     Status:  new
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:
      Port:  iperf                     |
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Comment (by msy@…):

 Was hoping to inject some life into this port.  I'd like to request that
 iperf3 be formally added to the main repo...  My vote goes to adding it as
 a new repo like brew did - I do still need both iperf (2.0.5) and iperf3
 (3.0.11), on at least a semi-regular basis.

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Ticket URL: <https://trac.macports.org/ticket/44299#comment:18>
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