Implement sock_addr_remote syscall (#1360)

Slightly changed the interface sock_addr_remote - since we already
have a `__wasi_addr_t` structure which is an union, there's no need
for passing length around - the address buffer will always have the
right length (i.e. max of all address families).

core/shared/platform/windows/win_socket.c

@@ -180,5 +180,14 @@ os_socket_addr_local(bh_socket_t socket, uint8_t *buf, size_t buflen,
 {
     errno = ENOSYS;
 
+    return BHT_ERROR;
+}
+
+int
+os_socket_addr_remote(bh_socket_t socket, uint8_t *buf, size_t buflen,
+                      uint16_t *port, uint8_t *is_ipv4)
+{
+    errno = ENOSYS;
+
     return BHT_ERROR;
 }