Security fix for the ALT Linux 10 package thunderbird version 78.2.1-alt1

Sept. 2, 2020 Andrey Cherepanov 78.2.1-alt1 - New version 78.2.1. - Fixes: + CVE-2020-15663 Downgrade attack on the Mozilla Maintenance Service could have resulted in escalation of privilege + CVE-2020-15664 Attacker-induced prompt for extension installation + CVE-2020-15670 Memory safety bugs...