This update for GraphicsMagick fixes the following issues:

Security vulnerabilities fixed:

- CVE-2018-20184: Fixed heap-based buffer overflow in the WriteTGAImage function of tga.c (bsc#1119822)
- CVE-2018-20189: Fixed denial of service vulnerability in ReadDIBImage function of coders/dib.c (bsc#1119790)

This update was imported from the openSUSE:Leap:15.0:Update update project.