Fix build with kernel 4.0

[euspectre]

cmake:
-- Checking the signature of net_device_ops::ndo_fdb_add()
CMake Error at cmake/modules/kmodule.cmake:749 (message):
Unknown signature of net_device_ops::ndo_fdb_add()
Call Stack (most recent call first):
functions/net/groups/net_device_ops/CMakeLists.txt:79 (check_ndo_fdb_add)

[euspectre]

Fixes are now in the repository. This bug should be closed when the next version of KernelStrider is released.