Security update for freerdp (important)

This update for freerdp fixes the following issues:

• CVE-2017-2834: Out-of-bounds write in license_recv() (bsc#1050714)
• CVE-2017-2835: Out-of-bounds write in rdp_recv_tpkt_pdu (bsc#1050712)
• CVE-2017-2836: Rdp Client Read Server Proprietary Certificate Denial of
  Service (bsc#1050699)
• CVE-2017-2837: Client GCC Read Server Security Data DoS (bsc#1050704)
• CVE-2017-2838: Client License Read Product Info Denial of Service
  Vulnerability (bsc#1050708)
• CVE-2017-2839: Client License Read Challenge Packet Denial of Service
  (bsc#1050711)

This update was imported from the SUSE:SLE-12-SP2:Update update project.