Security update for libraw (moderate)

This update for libraw fixes the following issues:

The following security vulnerabilities were addressed:

• CVE-2018-5804: Fixed a type confusion error within the identify function
  that could trigger a division by zero, leading to a denial of service
  (Dos). (boo#1097975)
• CVE-2018-5805: Fixed a boundary error within the quicktake_100_load_raw
  function that could cause a stack-based buffer overflow and subsequently
  trigger a crash. (boo#1097973)
• CVE-2018-5806: Fixed an error within the leaf_hdr_load_raw function that
  could trigger a NULL pointer deference, leading to a denial of service
  (DoS). (boo#1097974)
• CVE-2018-5808: Fixed an error within the find_green function that could
  cause a stack-based buffer overflow and subsequently execute arbitrary
  code. (boo#1118894)
• CVE-2018-5816: Fixed a type confusion error within the identify function
  that could trigger a division by zero, leading to a denial of service
  (DoS). (boo#1097975)