Security update for claws-mail

This update for claws-mail fixes the following issues:

- CVE-2020-15917: Fixed an improper handling of suffix data after STARTTLS is mishandled (boo#1174457).

This update was imported from the openSUSE:Leap:15.1:Update update project.

Fixed bugs
bnc#1174457
VUL-1: CVE-2020-15917: claws-mail: protocol violation because suffix data after STARTTLS is mishandled
Selected Binaries
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