tcmode-external-linaro.inc: Fix target flags.
tcmode-external-linaro.inc: Fix target flags.

Replace TARGET_SYS with ELT_TARGET_SYS for the TARGET_CPPFLAGS and
TARGET_LDFLAGS in order to let the cross compiler find its files.

Signed-off-by: Ken Werner <ae36958ca69fd249ce813d415cd5831a3fb45335@linaro.org>

linaro-home/meta-linaro,linaro-home/meta-linaro,xleng/meta-linaro,xleng/meta-linaro,xleng/meta-linaro,linaro-home/meta-linaro,linaro-home/meta-linaro,linaro-home/meta-linaro,xleng/meta-linaro,xleng/meta-linaro,linaro-home/meta-linaro