Security update for libass

This update for libass fixes the following issues:

- CVE-2020-36430: Fixed heap-based buffer overflow in decode_chars (bsc#1188539).

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

Fixed bugs
bnc#1188539
VUL-0: CVE-2020-36430: libass: heap-based buffer overflow in decode_chars
Selected Binaries
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