Log Message:
Changes 8.3.9:
* Protect against indirect security threats caused by index functions
  changing session-local state
* Reject SSL certificates containing an embedded null byte in the
  common name (CN) field
* Fix possible crash during backend-startup-time cache initialization
* Avoid crash on empty thesaurus dictionary
* Prevent signals from interrupting VACUUM at unsafe times
* Fix possible crash due to integer overflow in hash table size
  calculation
* Fix very rare crash in inet/cidr comparisons
* Ensure that shared tuple-level locks held by prepared transactions
  are not ignored
* Fix premature drop of temporary files used for a cursor that is
  accessed within a subtransaction
* Fix memory leak in syslogger process when rotating to a new CSV
  logfile
* Fix Windows permission-downgrade logic
* Fix incorrect logic for GiST index page splits, when the split
  depends on a non-first column of the index
* Don't error out if recycling or removing an old WAL file fails at
  the end of checkpoint
* Ensure WAL files aren't repeatedly archived on Windows
* Fix PAM password processing to be more robust
* Raise the maximum authentication token (Kerberos ticket) size in
  GSSAPI and SSPI authentication methods
* More...