Upgrade icedove to 45.1.0esr

Originally created by @anonym on #11530 (Redmine)

Currently version 1:45.1.0-1~deb8u1 is in Debian, which is higher than 38.8.0-1~deb8u1+tails3 from our custom APT suite. So the secure auto-configuration fixes are lost in current Tails builds.

We need to build new packages from 1:45.1.0-1~deb8u1 + our patches (which likely will need some refreshing).

Parent Task: #5663 (closed)

Edited May 15, 2020 by anonym

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