build system: add Chrome OS futility to tools

Change-Id: I08925d110c6faa9e37107d63bfa75d0ab677d379
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13545
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/util/futility/Makefile.inc b/util/futility/Makefile.inc
new file mode 100644
index 0000000..26b218d
--- /dev/null
+++ b/util/futility/Makefile.inc
@@ -0,0 +1,13 @@
+additional-dirs += $(objutil)/futility
+
+$(objutil)/futility/build/futility/futility:
+	@printf "    MAKE       $(subst $(objutil)/,,$(@))\n"
+	$(MAKE) -C $(VB_SOURCE) \
+		BUILD=$(abspath $@/../..) \
+		CC="$(HOSTCC)" \
+		V=$(V) \
+		$(abspath $@)
+
+$(objutil)/futility/futility: $(objutil)/futility/build/futility/futility
+	cp $< $@.tmp
+	mv $@.tmp $@