postgresql: Update to 8.4.19, 9.0.15, 9.1.11, 9.2.6

This is a critical update fixing several data corruption issues:

  http://www.postgresql.org/about/news/1492/

(cherry picked from commit 0c93c758bfc711edba57b765e9d6889c796af90b)
cacert: Update to 20131205

(cherry picked from commit 3f799e7233ad9cc2dc56eea9fa53e449f1e2237f)