Enable libnetfilter_log support

Packages describing “nflog” as local USE flag

Package “nflog” Flag Description
net-analyzer/suricata Enable libnetfilter_log support
app-admin/ulogd Build NFLOG input plugin to support stateless packet-based logging via nfnetlink_log
net-analyzer/pmacct Enable support for NFLOG through uacctd

All packages providing a “nflog” USE flag (2)