4GB limit with netstat

[Gregory Bond]

andy at evo6.org said:
> How much would need to change in either the kernel or netstat to make >
> 4GB possible? 

At the very least:
- edit sys/net/if.h & change struct if_data entries to u_int64_t.
- edit usr.bin/netstat/if.c intpr() & change variables to be u_int64_t
  and use %ull in printf strings
- redo all the layouts in if.c to handle the wider fields
- recompile everything in the entire system - kernel, world, all ports that 
  might look at network interfaces or routing tables, etc
- hope that the broken binary compatibility doesn't hurt too bad