- Welcome usable qemu pcap networking! :)
1. Fix packet delays. 
2. Truncate oversize packets according to host interface's MTU
to avoid e.g. Linux guests panic'ing.
Note: This is only necessary as a stopgap measure for cases like
host inferfaces using TSO (it still causes retransmissions),
the better workaround is to disable the feature on the host
interface while using qemu's pcap code.
- Add note about pcap to pkg-message.s
- Bump PORTREVISIONs.
Submitted by: jkim