SUSE-SU-2020:1749-1 Security update for tigervnc

This update for tigervnc fixes the following issues: - CVE-2019-15691: Fixed a use-after-return due to incorrect usage of stack memory in ZRLEDecoder bsc1159856. - CVE-2019-15692: Fixed a heap-based buffer overflow in CopyRectDecode bsc1160250. - CVE-2019-15693: Fixed a heap-based buffer overflow...