Documentation needs updating

[windrad6]

Documentation or cmake needs to be updated. libnl3 is not an optional dependency

https://villas.fein-aachen.org/docs/node/nodes/socket

Documentation:
This node-type does not have any special library dependencies. It is always available.

Optionally, libnl3 is used to setup network emulation as described in page Netem Emulation.

[stv0g]

Thanks for reporting. I will move this to the documentation repo. A contribution to fix this is welcome :)