Security update for Mozilla Thunderbird

This update for Mozilla Thunderbird to version 52.9.1 fixes multiple issues. Security issues fixed, inherited from the Mozilla common code base (MFSA 2018-16, bsc#1098998): - CVE-2018-12359: Buffer overflow using computed size of canvas element - CVE-2018-12360: Use-after-free when using focus() - CVE-2018-12362: Integer overflow in SSSE3 scaler - CVE-2018-12363: Use-after-free when appending DOM nodes - CVE-2018-12364: CSRF attacks through 307 redirects and NPAPI plugins - CVE-2018-12365: Compromised IPC child process can list local filenames - CVE-2018-12366: Invalid data handling during QCMS transformations - CVE-2018-5188: Memory safety bugs fixed in Thunderbird 52.9.0 Security issues fixed that affect e-mail privacy and integrity (including EFAIL): - CVE-2018-12372: S/MIME and PGP decryption oracles can be built with HTML emails (bsc#1100082) - CVE-2018-12373: S/MIME plaintext can be leaked through HTML reply/forward (bsc#1100079) - CVE-2018-12374: Using form to exfiltrate encrypted mail part by pressing enter in form field (bsc#1100081) The following options are available for added security in certain scenarios: - Option for not decrypting subordinate message parts that otherwise might reveal decryted content to the attacker. Preference mailnews.p7m_subparts_external needs to be set to true for added security. The following upstream changes are included: - Thunderbird will now prompt to compact IMAP folders even if the account is online - Fix various problems when forwarding messages inline when using 'simple' HTML view - Deleting or detaching attachments corrupted messages under certain circumstances (bsc#1100780) The following tracked packaging changes are included: - correct requires and provides handling (boo#1076907) - reduce memory footprint with %ix86 at linking time via additional compiler flags (boo#1091376) - Build from upstream source archive and verify source signature (boo#1085780)