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.

Fixed bugs
bnc#1177862
VUL-0: CVE-2020-26682: libass: signed integer overflow in the call to outline_stroke() from ass_outline_construct()
Selected Binaries
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