Security update for ImageMagick (moderate)

This update for ImageMagick fixes the following issues:

The following security vulnerabilities were fixed:

• CVE-2018-11625: Fixed heap-based buffer over-read in SetGrayscaleImage
  in the quantize.c file, which allowed remote attackers to cause buffer
  over-read via a crafted file. (bsc#1096200)
• CVE-2018-11624: Fixed a use-after-free issue in the ReadMATImage
  function in coders/mat.c. (bsc#1096203)
• CVE-2018-10805: Fixed several memory leaks in bgr.c, rgb.c, cmyk.c,
  gray.c, and ycbcr.c (bsc#1095812)
• CVE-2018-12600: The ReadDIBImage and WriteDIBImage functions allowed
  attackers to cause an out of bounds write via a crafted file
  (bsc#1098545).
• CVE-2018-12599: The ReadBMPImage and WriteBMPImage fucntions allowed
  attackers to cause an out of bounds write via a crafted file
  (bsc#1098546).

The following other changes were made:

• Fix -gamma issues in special cases. (bsc#1094745, bsc#1094742)

This update was imported from the SUSE:SLE-15:Update update project.