Update netinet/udp.h from Linux 4.18

[H.J. Lu]

On Mon, Aug 20, 2018 at 3:17 PM, Joseph Myers <joseph@codesourcery.com> wrote:
> This patch adds the UDP_SEGMENT constant from Linux 4.18 to
> netinet/udp.h.
>
> Tested for x86_64.
>
> 2018-08-20  Joseph Myers  <joseph@codesourcery.com>
>
>         * sysdeps/gnu/netinet/udp.h (UDP_SEGMENT): New macro.
>
> diff --git a/sysdeps/gnu/netinet/udp.h b/sysdeps/gnu/netinet/udp.h
> index eddd248655..45f007b7b5 100644
> --- a/sysdeps/gnu/netinet/udp.h
> +++ b/sysdeps/gnu/netinet/udp.h
> @@ -81,6 +81,7 @@ struct udphdr
>                                    over IPv6.  */
>  #define UDP_NO_CHECK6_RX 102   /* Disable accepting checksum for UDP
>                                    over IPv6.  */
> +#define UDP_SEGMENT    103     /* Set GSO segmentation size.  */
>
>  /* UDP encapsulation types */
>  #define UDP_ENCAP_ESPINUDP_NON_IKE 1   /* draft-ietf-ipsec-nat-t-ike-00/01 */

LGTM.

Thanks.

-- 
H.J.