Update to 0.48
    
    - New upstream release 0.48
      - Added support for db_exists and lock_detect
      - Fixed bug with c_pget when the DB_GET_BOTH flag is used
      - Fixed bug with db_pget when the DB_GET_BOTH flag is used
      - Changes to build with BDB 5.2
      - Add support for new Heap database format
      - Fixed test harness issue with Heap.t (CPAN RT#68818)
    - Don't package build tools mkconsts.pl and scan.pl