proper fix exists only in version >= 5.1


mysql-test/r/ndb_blob.result:
  bug#24028 in 5.0 only
mysql-test/t/ndb_blob.test:
  bug#24028 in 5.0 only
ndb/src/ndbapi/NdbBlob.cpp:
  bug#24028 in 5.0 only
ndb/test/ndbapi/testBlobs.cpp:
  bug#24028 in 5.0 only