MDEV-8827: Fix the 32-bit build

Follow-up to 07ba5560:
Use the correct 64-bit type name ulonglong instead of ulint,
like in mysql/mysql-server@4e0100d86b1b46be0107ebd46a98a0c2dbb0fab4

storage/innobase/handler/ha_innodb.cc

@@ -10476,7 +10476,7 @@ ha_innobase::get_auto_increment(
 	if (increment > 1 && thd_sql_command(user_thd) != SQLCOM_ALTER_TABLE
 	    && autoinc < col_max_value) {
 
-		ulint	prev_auto_inc = autoinc;
+		ulonglong prev_auto_inc = autoinc;
 
 		autoinc = ((autoinc - 1) + increment - offset)/ increment;
 

storage/xtradb/handler/ha_innodb.cc

@@ -11745,7 +11745,7 @@ ha_innobase::get_auto_increment(
 	if (increment > 1 && thd_sql_command(user_thd) != SQLCOM_ALTER_TABLE
 	    && autoinc < col_max_value) {
 
-		ulint	prev_auto_inc = autoinc;
+		ulonglong prev_auto_inc = autoinc;
 
 		autoinc = ((autoinc - 1) + increment - offset)/ increment;