增加Maat_rule_sort_by_exec_seq函数，可以按执行顺序对策略排序。

inc/Maat_rule.h

@@ -259,6 +259,12 @@ int Maat_rule_get_ex_new_index(Maat_feather_t feather, const char* compile_table
 //returned data is duplicated by dup_func of Maat_rule_get_ex_new_index,  caller is responsible to free the data.
 MAAT_RULE_EX_DATA Maat_rule_get_ex_data(Maat_feather_t feather, const struct Maat_rule_t* rule, int idx);
 
+//Sort rule by execute sequence.
+//rule_array will be modified with sorted rule.
+//Return sortted rule number, maybe less than n_rule if some rules are invalid.
+size_t Maat_rule_sort_by_exec_seq(Maat_feather_t feather, struct Maat_rule_t* rule_array, size_t n_rule);
+
+
 //Helper function for parsing space or tab seperated line.
 //Nth_column: the Nth column is numberd from 1.
 //Return 0 if success.