x86/smmstub: Fix compiling with external toolchains

This copies the makefile code from the smm/smm.o.

Now works with clang version 7.0.1 from my OS using
CONFIG_ANY_TOOLCHAIN.

Change-Id: I298d24d54b8fb27da96257ccda65b7fbee988ebb
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30504
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions