This has a variety of fixes from 7.2.2, including fixes to prevent
possible data loss.
A dump/restore is not required for those running
7.2.X.
Prevent possible compressed transaction log loss (Tom)
Prevent non-superuser from increasing most recent vacuum info (Tom)
Handle pre-1970 date values in newer versions of glibc (Tom)
Fix possible hang during server shutdown
Prevent spinlock hangs on SMP PPC machines (Tomoyuki Niijima)
Fix pg_dump to properly dump FULL JOIN USING (Tom)
