Security update for libxml2

This update for libxml2 fixes the following issues:

- CVE-2019-19956: Reverted the upstream fix for this memory leak because it introduced other, more severe vulnerabilities (bsc#1172021).

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

Fixed bugs
bnc#1172021
Recent update of libxml2-2 generates invalid xmlns reference
Selected Binaries
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