[MacPorts] #58026: libssh : upgrade (fixes distfile issue)

[MacPorts]

#58026: libssh : upgrade (fixes distfile issue)
----------------------+--------------------
 Reporter:  RJVB      |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  haspatch  |       Port:  libssh
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 I was informed that my macstrop version of port:libssh failed on a
 distfile downloading error.

 This patch fixes that by changing the master_sites URL and upgrades libssh
 to 0.8.6 . Revbumping is not required.

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Ticket URL: <https://trac.macports.org/ticket/58026>
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