libnl: Removal from IPFire

libnl: Removal from IPFire

- This is the legacy version of libnl - 1.1.4 and was released in 2013
- libnl-3 is the running stable version - 3.5.0
- Nothing in IPFire has libnl as a dependency. Large number of programs have libnl-3 as
   a dependency
- libnl developer indicates that libnl-3 should be used if in any way possible and that
   the legacy version is for situations that fail to work with libnl-3
- As everything in IPFire looks to already be using libnl-3 this patch is to remove the
   legacy version

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>