backports: handle new ndo_set_vf_spoofchk pointer in struct net_device_ops

backports: handle new ndo_set_vf_spoofchk pointer in struct net_device_ops

In kernel 3.2 struct net_device_ops got a new function pointer
ndo_set_vf_spoofchk. Address this by putting ifdef around the code.

commit 5f8444a3fa617076f8da51a3e8ecce01a5d7f738
Author: Greg Rose <gregory.v.rose@intel.com>
Date:   Sat Oct 8 03:05:24 2011 +0000

    if_link: Add additional parameter to IFLA_VF_INFO for spoof checking

git describe --contains 5f8444a3fa617076f8da51a3e8ecce01a5d7f738
v3.2-rc1~129^2~87

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>