The variable `RM` is empty and thus set it to `rm`. While
executing the `clean` rule, run each `rm` command with the -f flag
to ignore non-existing files.
Also, disable the objutil feature locally fixing another build issue.
Change-Id: Icb17e2c924ef480f8ac6195f96cf495709a0a023
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62415
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
