windows: fix buffer overflow on uv__getnameinfo_work()

According to
http://msdn.microsoft.com/en-us/library/windows/desktop/ms738531.aspx,
"NodeBufferSize" and "ServiceBufferSize" parameters of GetNameInfoW()
function are expected to represent the number of WCHAR, not the buffer size
of memory layout.
windows: add uv_backend_timeout
test: disable tcp_close_accept on Windows

It always was a Unix only test