ws2_32/test: Fix sockaddr buffer overflow in test_reuseaddr.
Today, test_reuseaddr() triggers a buffer overflow when accept()-ing an
IPv6 client due to the supplied peer name buffer (struct sockaddr
)
being too small to hold an AF_INET6 address (struct sockaddr_in6
).
Fix this by changing the type of saddr
from struct sockaddr
to
struct sockaddr_storage
.