No rule to make target 'certs/rhel.pem', needed by 'certs/x509_certificate_list'

需要置空内核配置文件中的 CONFIG_SYSTEM_TRUSTED_KEYS 选项： CONFIG_SYSTEM_TRUSTED_KEYS=""

即修改linux内核文件的.config文件，查找CONFIG_SYSTEM_TRUSTED_KEYS，然后置空