o Use INADDR_ANY and INADDR_BROADCAST instead of 0 and 0xffffffff
for IP addresses & masks.
o Move struct compreq into ipcp.c (it's none of anyone elses
business).
o Rename MAX_STATES to MAX_VJ_STATES.
o Take note of the return value of the compression layers
init routine, and if it fails, bring the whole layer
cleanly back down again.
o Only use srandomdev() if ``__FreeBSD__ > 2'' - this makes
these sources buildable on 2.2 (where I'm testing).
