Security fix for the ALT Linux 10 package libtiff version 4.2.0-alt1

Dec. 25, 2020 Vladimir D. Seleznev 4.2.0-alt1 - Updated to v4.2.0 fixed CVE-2020-35521, CVE-2020-35522, CVE-2020-35523 and CVE-2020-35524...