s390: disable asm code expolines if cc does not support it
To avoid a mixture of asm code with expolines and c code without them, propagate CC_USING_EXPOLINE to KBUILD_AFLAGS and use it to detect whether asm code should have expolines or not. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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