Log Message:
libssh: update to 0.86.

version 0.8.6 (released 2018-12-24)
  * Fixed compilation issues with different OpenSSL versions
  * Fixed StrictHostKeyChecking in new knownhosts API
  * Fixed ssh_send_keepalive() with packet filter
  * Fixed possible crash with knownhosts options
  * Fixed issus with rekeying
  * Fixed strong ECDSA keys
  * Fixed some issues with rsa-sha2 extentions
  * Fixed access violation in ssh_init() (static linking)
  * Fixed ssh_channel_close() handling