Update to 10.0.12

Changelog: from http://www.mozilla.org/en-US/thunderbird/10.0.12/releasenotes/
    FIXED
    Security fixes can be found here

MFSA 2013-20 Mis-issued TURKTRUST certificates
MFSA 2013-17 Use-after-free in ListenerManager
MFSA 2013-16 Use-after-free in serializeToStream
MFSA 2013-15 Privilege escalation through plugin objects
MFSA 2013-12 Buffer overflow in Javascript string concatenation
MFSA 2013-11 Address space layout leaked in XBL objects
MFSA 2013-09 Compartment mismatch with quickstubs returned values
MFSA 2013-05 Use-after-free when displaying table with many columns and column groups
MFSA 2013-04 URL spoofing in addressbar during page loads
MFSA 2013-02 Use-after-free and buffer overflow issues found using Address Sanitizer
MFSA 2013-01 Miscellaneous memory safety hazards (rv:18.0/ rv:10.0.12 / rv:17.0.2)

(ryoon)