MozillaThunderbird: Update fixes six security issues

MozillaThunderbird was updated to version 24.6.0 to fix six security issues:
* Miscellaneous memory safety hazards (CVE-2014-1533/CVE-2014-1534)
* Use-after-free and out of bounds issues found using Address Sanitizer (CVE-2014-1536/CVE-2014-1537/CVE-2014-1538)
* Use-after-free with SMIL Animation Controller (CVE-2014-1541)

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