Modify the PCAP filter to allow multicast packets

[cold-brewed]

Summary

This PR modifies the PCAP filter accordingly:

• Multicast packets are now passed through
• The broadcast keyword is used instead of ff:ff:ff:ff:ff:ff

The biggest effect is fixing NetBEUI / NetBIOS which was not working before: NetBEUI uses a multicast address (03:00:00:00:00:01) instead of a standard ethernet broadcast which was not passing the PCAP filter.

Anything that uses NetBEUI / NetBIOS should now work with PCAP, including LAN Manager. Any other L3 that uses multicast should also now work.

Screenshot of win98 with no TCP/IP installed, using only NetBEUI to communicate with another win98 host configured the same:

Checklist

• I have discussed this with core contributors already

References

N/A

[NJRoadfan]

This should also fix AppleTalk if someone is using NT Services For Macintosh or PCMacLAN in a VM.