MGASA-2018-0316 Updated thunderbird packages fix security vulnerabilities

The updated packages fix several bugs and some security issues: Buffer overflow using computed size of canvas element. CVE-2018-12359 Use-after-free when using focus. CVE-2018-12360 S/MIME and PGP decryption oracles can be built with HTML emails. CVE-2018-12372 S/MIME plaintext can be leaked...