utils/check-package: warn about utf-8 characters in .mk files

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Tested-by: Titouan Christophe <titouan.christophe@railnova.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2 files changed