This update for GraphicsMagick fixes the following issues:

Security issue fixed:

- CVE-2018-18544: Fixed memory leak in the function WriteMSLImage of coders/msl.c (bsc#1113064).

Non-security issues fixed:

- asan_build: build ASAN included
- debug_build: build more suitable for debugging

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