https://review.coreboot.org/c/coreboot/+/89004

fix compilation when CFLAGS is set (which in Gentoo it always is)

--- a/util/intelmetool/Makefile
+++ b/util/intelmetool/Makefile
@@ -7,6 +7,8 @@
 INSTALL ?= /usr/bin/env install
 PREFIX  ?= /usr/local
 CFLAGS  ?= -O0 -g -Wall -Wextra -Wno-unused-parameter -Wno-sign-compare -Wno-unused-function \
+#  \ on prev and next line for patch
+CFLAGS  += \
            -I $(TOP)/src/commonlib/bsd/include
 LDFLAGS += -lpci -lz