Log Message:
libssh: update to 0.7.6. security fix.

version 0.7.6 (released 2018-10-16)
  * Fixed CVE-2018-10933
  * Added support for OpenSSL 1.1
  * Added SHA256 support for ssh_get_publickey_hash()
  * Fixed config parsing
  * Fixed random memory corruption when importing pubkeys

version 0.7.5 (released 2017-04-13)
  * Fixed a memory allocation issue with buffers
  * Fixed PKI on Windows
  * Fixed some SSHv1 functions
  * Fixed config hostname expansion

version 0.7.4 (released 2017-02-03)
  * Added id_ed25519 to the default identity list
  * Fixed sftp EOF packet handling
  * Fixed ssh_send_banner() to confirm with RFC 4253
  * Fixed some memory leaks