define COMPAT_OLDSOCKOPT to get new kernels to work with the
old args to [sg]sockopt. this is going to go away "soon".
note that this option only has effect if MULTICAST is not defined.
fixed bug where large amounts of unidirectional UDP traffic would fill
the interface output queue and further udp packets would be fragmented
and only partially sent - keeping the output queue full and jamming the
network, but not actually getting any real work done (because you can't
send just 'part' of a udp packet - if you fragment it, you must send
the whole thing). The fix involves adding a check to make sure that the
output queue has sufficient space for all of the fragments.
cgd