The build system will generate the correct Signtool 
according to the feature option CUSTOM_SEC_SIGNTOOL_SUPPORT when building project.

If you need to test or generate by yourself, please use the following commands.

Use the following command to build for MTK SignTool:
	sh script/mtk_build.sh

Use the following command to build for customer SignTool:
	sh script/cust_build.sh
