Security update for graphite2

This update for graphite2 fixes the following issues:

- CVE-2018-7999: Fixed a NULL pointer dereference vulnerability in Segment.cpp that may cause a denial of serivce (bsc#1084850).

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

Fixed bugs
bnc#1084850
VUL-0: CVE-2018-7999: graphite2: A NULL pointer dereference vulnerability was found in Segment.cpp during a dumbRendering operation, which may allow attackers to cause a denial of service
Selected Binaries
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