Update databases/db4 to 4.3.29. This is a point release update over

Update databases/db4 to 4.3.29.  This is a point release update over
4.3.28, so there are no API changes, and applications may be upgraded
by relinking against db4-4.3.29.  We stop pretending to support a
"java" package option since we never even bothered with handling the
PLIST differences.  Changes from version 4.3.28 include:

   * The on-disk log format has changed.
   * Add support for lightweight, transactionally protected Sequence
     Number generation.
   * Add support for Degree 2 isolation.
   * Add election generation information to replication to support Paxos
     compliance.
   * A huge number of bug fixes, including eliminating some instances of
     application deadlock and memory leak fixes.
   * Some minor performance enhancements.