[MacPorts] #32482: rtmpdump: update to 2.4

[MacPorts]

#32482: rtmpdump: update to 2.4
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  Reporter:  dargo@…   |      Owner:  captsolo@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch
      Port:  rtmpdump  |
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Comment (by ryandesign@…):

 `port echo depends:rtmpdump` will only find ports that depend on rtmpdump
 in their default variants. To find ports that that might depend on it in a
 non-default variant, you can use `port file all | sort -u | xargs grep
 :rtmpdump` but that doesn't turn up any either. I guess we can update the
 port without needing to change any other ports.

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Ticket URL: <https://trac.macports.org/ticket/32482#comment:13>
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