Security update for libass
This update for libass fixes the following issues:
- CVE-2020-26682: Fixed a signed integer overflow in the call to outline_stroke() (bsc#1177862).
This update was imported from the SUSE:SLE-15:Update update project.
- Submitted by Petr Gajdos (pgajdos)
Fixed bugs
bnc#1177862
VUL-0: CVE-2020-26682: libass: signed integer overflow in the call to outline_stroke() from ass_outline_construct()