Log Message:
Update "thunderbird" package to version 24.5.0.

The following security problems were fixed in this release:
- MFSA 2014-46 Use-after-free in nsHostResolve
- MFSA 2014-44 Use-after-free in imgLoader while resizing images
- MFSA 2014-43 Cross-site scripting (XSS) using history navigations
- MFSA 2014-42 Privilege escalation through Web Notification API
- MFSA 2014-38 Buffer overflow when using non-XBL object as XBL
- MFSA 2014-37 Out of bounds read while decoding JPG images
- MFSA 2014-35 Privilege escalation through Mozilla Maintenance Service
               Installer
- MFSA 2014-34 Miscellaneous memory safety hazards