[MacPorts] #50667: Update pv to 1.6.0

[MacPorts]

#50667: Update pv to 1.6.0
------------------------+---------------------------
 Reporter:  eborisch@…  |      Owner:  mark.carver@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:  haspatch    |       Port:  pv
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 Patch attached to update pv to 1.6.0. The patchfile files/stat64.diff can
 go away in the process.

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Ticket URL: <https://trac.macports.org/ticket/50667>
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