toolchain/xtools: enhance include search path to sysroot

For xtools, add sysroot also to include search path.

Change-Id: I72d37c54eb7f3693d3a207a35802b29b150c84f1
Signed-off-by: Sakari Poussa <sakari.poussa@intel.com>

scripts/Makefile.toolchain.xtools

@@ -5,18 +5,21 @@ endif
 CROSS_COMPILE_TARGET_arm = arm-none-eabi
 CROSS_COMPILE_arm=${XTOOLS_TOOLCHAIN_PATH}/${CROSS_COMPILE_TARGET_arm}/bin/${CROSS_COMPILE_TARGET_arm}-
 CROSS_COMPILE_arm_version ?= $(shell $(CROSS_COMPILE_arm)gcc -dumpversion)
+TOOLCHAIN_CFLAGS_arm = -I${XTOOLS_TOOLCHAIN_PATH}/${CROSS_COMPILE_TARGET_arm}/${CROSS_COMPILE_TARGET_arm}/sysroot/usr/include
 
 
 CROSS_COMPILE_TARGET_x86 = i586-pc-elf
 CROSS_COMPILE_x86=${XTOOLS_TOOLCHAIN_PATH}/${CROSS_COMPILE_TARGET_x86}/bin/${CROSS_COMPILE_TARGET_x86}-
 CROSS_COMPILE_x86_version ?= $(shell $(CROSS_COMPILE_x86)gcc -dumpversion)
+TOOLCHAIN_CFLAGS_x86 = -I${XTOOLS_TOOLCHAIN_PATH}/${CROSS_COMPILE_TARGET_x86}/${CROSS_COMPILE_TARGET_x86}/sysroot/usr/include
 
 CROSS_COMPILE= $(CROSS_COMPILE_$(ARCH))
 CROSS_COMPILE_TARGET = ${CROSS_COMPILE_TARGET_${ARCH}}
 CROSS_COMPILE_version = ${CROSS_COMPILE_${ARCH}_version}
+TOOLCHAIN_CFLAGS = ${TOOLCHAIN_CFLAGS_${ARCH}}
 
 TOOLCHAIN_LIBS = gcc
 
 LIB_INCLUDE_DIR += -L ${XTOOLS_TOOLCHAIN_PATH}/${CROSS_COMPILE_TARGET}/lib/gcc/${CROSS_COMPILE_TARGET}/${CROSS_COMPILE_version}/
 
-export CROSS_COMPILE TOOLCHAIN_LIBS LIB_INCLUDE_DIR
+export CROSS_COMPILE TOOLCHAIN_LIBS LIB_INCLUDE_DIR TOOLCHAIN_CFLAGS