The linux.mk makefile needs to be guarded, because it introduces a
dependency on the perl tooling.
Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Change-Id: Ieb7aac672072858e0d6811628887f6a9eb9a8cb1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76715
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
aad4199670