libnet: PF_PACKET is always available on Linux

[Thomas: remove mistakenly added empty line.]

Signed-off-by: Joris Lijssens <joris.lijssens@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libnet/libnet.mk

@@ -7,6 +7,8 @@
 LIBNET_VERSION = 1.1.6
 LIBNET_SITE = http://sourceforge.net/projects/libnet-dev/files
 LIBNET_INSTALL_STAGING = YES
+# PF_PACKET is always available on Linux
+LIBNET_CONF_OPTS = libnet_cv_have_packet_socket=yes
 LIBNET_LICENSE = BSD-2c, BSD-3c
 LIBNET_LICENSE_FILES = doc/COPYING