libpcap: update libnl fix patch

We also need to nuke bad LIBS assumptions, fixes:
http://autobuild.buildroot.net/results/bbd/bbde2b62d4b677e71a62b25fb9ccb4ac4764a4aa/
http://autobuild.buildroot.net/results/5de/5dedfb19df476a633e4449d44e7ba2778bf5b737/


...and lots more of those kind.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: Romain Naour <romain.naour@openwide.fr>
Tested-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>