Restrictive mdb_copy file mode.

Copied from 58ddb552.

libraries/liblmdb/mdb_copy.c

@@ -64,7 +64,7 @@ int main(int argc,char * argv[])
 	act = "opening environment";
 	rc = mdb_env_create(&env);
 	if (rc == MDB_SUCCESS) {
-		rc = mdb_env_open(env, argv[1], flags, 0664);
+		rc = mdb_env_open(env, argv[1], flags, 0600);
 	}
 	if (rc == MDB_SUCCESS) {
 		act = "copying";