Security update for openjpeg2 (moderate)

This update for openjpeg2 fixes the following security issues:

• CVE-2015-1239: A double free vulnerability in the j2k_read_ppm_v3
  function allowed remote attackers to cause a denial of service (crash)
  (bsc#1066713)
• CVE-2017-17479: A stack-based buffer overflow in the pgxtoimage function
  in jpwl/convert.c could crash the converter. (bsc#1072125)
• CVE-2017-17480: A stack-based buffer overflow in the pgxtovolume
  function in jp3d/convert.c could crash the converter. (bsc#1072124)

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