Improve and of ICMP messages on Windows.
Improve and of ICMP messages on Windows.

When an ICMP message is received on Windows 10 for a UDP socket,
WSAECONNRESET is reported as an error. In this case, just read
again.

Thanks to nxrighthere for reporting the issue and helping to
nail it down.

This fixes #309.

CoolmanCZ/usrsctp,weinrank/usrsctp,CoolmanCZ/usrsctp,weinrank/usrsctp,weinrank/usrsctp,sctplab/usrsctp,CoolmanCZ/usrsctp,sctplab/usrsctp,CoolmanCZ/usrsctp,sctplab/usrsctp