fixes #672 MSVC x64 reports compiler warnings in usock_win.inc
fixes #672 MSVC x64 reports compiler warnings in usock_win.inc

featherweight/ftw-kernel-nanomsg,thisco-de/nanomsg,reqshark/nanomsg,reqshark/nanomsg,reqshark/nanomsg,featherweight/ftw-kernel-nanomsg,snikulov/nanomsg,thisco-de/nanomsg,snikulov/nanomsg