netdev: add HAVE_NET_DEVICE_OPS
As a concession to vendors who have to deal with one source for different kernel versions, add a HAVE_NET_DEVICE_OPS so they don't end up hard coding ifdef against kernel version. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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