test: fix cunit include path
test: fix cunit include path

If CUnit is placed in non standard directory and path
to it specified with configure option following error
occurs:
fatal error: CUnit/Basic.h: No such file or directory
Patch corrects CFLAGS to make compilation pass.

Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>
Reviewed-by: Dmitry Eremin-Solenikov <05e7612c354c8479a2d1e9b11fb63ce18664b3ca@linaro.org>
Reviewed-by: Bill Fischofer <52f3c909d51cc5d355a68a403df6906b3c1a8f83@linaro.org>

dkrot/odp,dkrot/odp,dkrot/odp,dkrot/odp