Update to 0.52
    
    - New upstream release 0.52
      - Updates for BDB 6.0 - added Blob support
        - Added BerkeleyDB::DbStream class to interface to Blobs
        - Added BlobThreshold and BlobDir options to BerkeleyDB::Env constructor
        - Added BlobThreshold and BlobDir options to Hash, Btree and Heap
          constructors
        - Added get_blob_threshold method to BerkeleyDB::Env
        - Added get_blob_dir method to BerkeleyDB::Env
        - Added get_blob_threshold method to Hash, Btree and Heap
        - Added get_blob_dir method to Hash, Btree and Heap
      - Added method $cursor->set_partial
      - Added method $cursor->partial_clear
      - Fixed $env->lock_detect dies due to incorrect version check (CPAN RT#84179)
      - Fixed memory leak in db_verify() method with libdb < 4.2 (CPAN RT##84409)
      - Fixed a few croaks
    - Drop %defattr, redundant since rpm 4.4