Release 3.2: DB_ENV->set_mutexlocks

Previous Berkeley DB releases included the db_env_set_mutexlocks function, intended for debugging, that allows applications to always obtain requested mutual exclusion mutexes without regard for their availability. This function has been replaced with dbenv_set_mutexlocks, which provides the same functionality on a per-database environment basis. Applications using the old function should be updated to use the new one.