norm: fix build failure with old headers

norm: fix build failure with old headers

The version check for the nfq_get_payload prototype is wrong since it's
done against linux headers when in fact it changed with the 1.0.0
release of libnetfilter_queue, leading to build failure in toolchains
that have old headers when libnetfilter_queue is present. Fixes:
http://autobuild.buildroot.net/results/c0e/c0e897a6db888d4a7e0302cdc1e0cbec7d1e88f3/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>