Security fix for the ALT Linux 8 package libssh2 version 1.4.3-alt3.M80P.1

1.4.3-alt3.M80P.1 built April 24, 2019 Aleksei Nikiforov in task #227571

April 19, 2019 Aleksei Nikiforov

- Fixes:
  + CVE-2016-0787 Truncated Diffie-Hellman secret length
  + CVE-2019-3855 Possible integer overflow in transport read allows out-of-bounds write
  + CVE-2019-3856 Possible integer overflow in keyboard interactive handling allows out-of-bounds write
  + CVE-2019-3857 Possible integer overflow leading to zero-byte allocation and out-of-bounds write
  + CVE-2019-3858 Possible zero-byte allocation leading to an out-of-bounds read
  + CVE-2019-3859 Out-of-bounds reads with specially crafted payloads due to unchecked use of
    _libssh2_packet_require and _libssh2_packet_requirev
  + CVE-2019-3860 Out-of-bounds reads with specially crafted SFTP packets
  + CVE-2019-3861 Out-of-bounds reads with specially crafted SSH packets
  + CVE-2019-3862 Out-of-bounds memory comparison
  + CVE-2019-3863 Integer overflow in user authenicate keyboard interactive allows out-of-bounds writes