Implement SECCOMP BPF filter in wifi_signature.
Implement SECCOMP BPF filter in wifi_signature.

We'd previously implemented a SECCOMP BPF filter
in anonymize_pcap, add a similar implementation in
wifi_signature. Both utilities parse pcap files of
potentially questionable provenance, either if pcap
files are submitted by others or if running them live
as part of a demo.

NetworkDeviceTaxonomy/wifi_taxonomy,NetworkDeviceTaxonomy/wifi_taxonomy,NetworkDeviceTaxonomy/wifi_taxonomy,NetworkDeviceTaxonomy/wifi_taxonomy