[BUG] load mysql.user error because lack of mysql-schema-create.sql

[jackwener]

Describe the bug
It was not possible to process file: mysql.user-schema.sql because of lacking of mysql-schema-create.sql

When I add mysql-schema-create.sql, restore is successful.

To Reproduce
mydumper -h 127.0.0.1 --port=3306 --password=** --user=root -o . --regex='^(mysql\.user$)'

There isn't file named mysql-schema-create.sql, which cause error of myloader

Expected behavior
There is file named mysql-schema-create.sql.

Environment (please complete the following information):

• OS version: Debian-buster
• MyDumper version: mydumper 0.11.1, built against MySQL 5.7.33-36