Security update for graphviz

This update for graphviz fixes the following issues:

- CVE-2018-10196: Fixed a null dereference in rebuild_vlis (bsc#1093447).

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

Fixed bugs
bnc#1093447
VUL-1: CVE-2018-10196: graphviz: NULL derefence in rebuild_vlis]
Selected Binaries
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