Fix Windows compile error when neither INET nor INET6 is defined.
Fix Windows compile error when neither INET nor INET6 is defined.

faithfracture/usrsctp,weinrank/usrsctp,sctplab/usrsctp,JlnWntr/usrsctp,CoolmanCZ/usrsctp,CoolmanCZ/usrsctp,weinrank/usrsctp,sctplab/usrsctp,weinrank/usrsctp,sctplab/usrsctp,faithfracture/usrsctp,CoolmanCZ/usrsctp,faithfracture/usrsctp,CoolmanCZ/usrsctp,JlnWntr/usrsctp,JlnWntr/usrsctp