thunderbird security update

1.5.0.12-23.0.1.el4 - Add thunderbird-oracle-default-prefs.js for errata rebuild and remove thunderbird-redhat-default-prefs.js - Replaced clean.gif in tarball 1.5.0.12-23 - Added fix for mozbz495057 1.5.0.12-22 - Added build fix 1.5.0.12-21 - Update patchset to fix regression as per 1.9.0.11...