MDEV-16708: fixed failure of the test sys_vars.sql_select_limit_func

This test failed in case it was run in PS mode and for embedded server

The reason of test failure was that the following fields
  affected_row, server_status, insert_id
of the structure MYSQL_STMT weren't update on calling
mysql_stmt_next_result() in case combination of binary protocol
and embedded server used.

libmysqld/libmysql.c

@@ -4936,6 +4936,12 @@ int STDCALL mysql_stmt_next_result(MYSQL_STMT *stmt)
     alloc_stmt_fields(stmt);
     prepare_to_fetch_result(stmt);
   }
+  else
+  {
+    stmt->affected_rows= stmt->mysql->affected_rows;
+    stmt->server_status= stmt->mysql->server_status;
+    stmt->insert_id= stmt->mysql->insert_id;
+  }
 
   DBUG_RETURN(0);
 }