Security update for libxml2

This update for libxml2 fixes the following issues:

- CVE-2020-24977: Fixed a global-buffer-overflow in xmlEncodeEntitiesInternal (bsc#1176179).

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

Fixed bugs
bnc#1176179
VUL-1: CVE-2020-24977: libxml2: global Buffer Overflow vulnerability in xmlEncodeEntitiesInternal at libxml2/entities.c
Selected Binaries
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