SUSE-SU-2020:2609-1 Security update for libxml2

This update for libxml2 fixes the following issues: - CVE-2019-20388: Fixed a memory leak in xmlSchemaPreRun bsc1161521. - CVE-2020-7595: Fixed an infinite loop in an EOF situation bsc1161517. - CVE-2020-24977: Fixed a global-buffer-overflow in xmlEncodeEntitiesInternal bsc1176179. - Fixed invali...