MDEV-16862 build failure for WITH_INNODB_AHI=0

Fix the build, which was broken by MDEV-16515.

Author: dr-m

storage/innobase/row/row0import.cc

@@ -3928,7 +3928,7 @@ row_import_for_mysql(
 
 	DBUG_EXECUTE_IF("ib_import_reset_space_and_lsn_failure",
 			err = DB_TOO_MANY_CONCURRENT_TRXS;);
-
+#ifdef BTR_CUR_HASH_ADAPT
 	/* On DISCARD TABLESPACE, we did not drop any adaptive hash
 	index entries. If we replaced the discarded tablespace with a
 	smaller one here, there could still be some adaptive hash
@@ -3945,6 +3945,7 @@ row_import_for_mysql(
 			break;
 		}
 	}
+#endif /* BTR_CUR_HASH_ADAPT */
 
 	if (err != DB_SUCCESS) {
 		char	table_name[MAX_FULL_NAME_LEN + 1];

storage/innobase/row/row0mysql.cc

@@ -3433,6 +3433,7 @@ row_drop_table_for_mysql(
 
 	if (!dict_table_is_temporary(table)) {
 		if (table->space != TRX_SYS_SPACE) {
+#ifdef BTR_CUR_HASH_ADAPT
 			/* On DISCARD TABLESPACE, we would not drop the
 			adaptive hash index entries. If the tablespace is
 			missing here, delete-marking the record in SYS_INDEXES
@@ -3454,6 +3455,7 @@ row_drop_table_for_mysql(
 					goto funct_exit;
 				}
 			}
+#endif /* BTR_CUR_HASH_ADAPT */
 
 			/* Delete the link file if used. */
 			if (DICT_TF_HAS_DATA_DIR(table->flags)) {