build: remove Linux non-netlink config

This path is deprecated, completely untested, likely broken and will not
be maintained.  Kill it with fire.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Acked-by: Greg Troxel <gdt@ir.bbn.com>
Acked-by: Feng Lu <lu.feng@6wind.com>
Acked-by: Paul Jakma <paul@jakma.org>
4 files changed