unit_tests: fix build without berkeleydb

tests/unit_tests/blockchain_db.cpp

@@ -37,7 +37,9 @@
 
 #include "blockchain_db/blockchain_db.h"
 #include "blockchain_db/lmdb/db_lmdb.h"
+#ifdef BERKELEY_DB
 #include "blockchain_db/berkeleydb/db_bdb.h"
+#endif
 #include "cryptonote_core/cryptonote_format_utils.h"
 
 using namespace cryptonote;
@@ -223,7 +225,11 @@ protected:
 
 using testing::Types;
 
-typedef Types<BlockchainLMDB, BlockchainBDB> implementations;
+typedef Types<BlockchainLMDB
+#ifdef BERKELEY_DB
+  , BlockchainBDB
+#endif
+> implementations;
 
 TYPED_TEST_CASE(BlockchainDBTest, implementations);