ghostscript was updated to fix one security issue and one bug.

The following vulnerability was fixed:

* CVE-2015-3228: Specially crafted ps files could have caused an out of
bound read/write due to an integer overflow, causing a segfault in the
application or having unspecified further impact.

Also a non security bug was fixed:
- fix a crash in mutex handling (bsc#963017)

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