MDEV-24715 Assertion !node->table->skip_alter_undo in CREATE...REPLACE SELECT

In commit 3cef4f8f (MDEV-515)
we inadvertently broke CREATE TABLE...REPLACE SELECT statements
by wrongly disabling row-level undo logging.

select_create::prepare(): Only invoke extra(HA_EXTRA_BEGIN_ALTER_COPY)
if no special treatment of duplicates is needed.

mysql-test/suite/innodb/r/insert_into_empty.result

+#
+# MDEV-24715 Assertion !node->table->skip_alter_undo
+#
+CREATE TABLE t (a INT UNIQUE) ENGINE=InnoDB
+REPLACE SELECT 1 AS a, 2 AS b UNION SELECT 1 AS a, 3 AS c;
+SELECT * FROM t;
+a	b
+1	3
+DROP TABLE t;
+CREATE TEMPORARY TABLE t (a INT UNIQUE) ENGINE=InnoDB
+REPLACE SELECT 1 AS a, 2 AS b UNION SELECT 1 AS a, 3 AS c;
+SELECT * FROM t;
+a	b
+1	3
+DROP TEMPORARY TABLE t;

mysql-test/suite/innodb/t/insert_into_empty.test

+--source include/have_innodb.inc
+
+--echo #
+--echo # MDEV-24715 Assertion !node->table->skip_alter_undo
+--echo #
+CREATE TABLE t (a INT UNIQUE) ENGINE=InnoDB
+REPLACE SELECT 1 AS a, 2 AS b UNION SELECT 1 AS a, 3 AS c;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TEMPORARY TABLE t (a INT UNIQUE) ENGINE=InnoDB
+REPLACE SELECT 1 AS a, 2 AS b UNION SELECT 1 AS a, 3 AS c;
+SELECT * FROM t;
+DROP TEMPORARY TABLE t;

sql/sql_insert.cc

@@ -4746,6 +4746,7 @@ select_create::prepare(List<Item> &_values, SELECT_LEX_UNIT *u)
   if (thd->locked_tables_mode <= LTM_LOCK_TABLES)
   {
     table->file->ha_start_bulk_insert((ha_rows) 0);
+    if (thd->lex->duplicates == DUP_ERROR && !thd->lex->ignore)
       table->file->extra(HA_EXTRA_BEGIN_ALTER_COPY);
   }
   thd->abort_on_warning= !info.ignore && thd->is_strict_mode();