Add netinet/in.h values from Linux 4.2.

This patch adds new constants from Linux 4.2 to netinet/in.h:
IPPROTO_MPLS and IP_BIND_ADDRESS_NO_PORT (both in
include/uapi/linux/in.h in Linux; one directly in netinet/in.h, one in
bits/in.h in glibc).

Tested for x86_64 (testsuite, and that installed stripped shared
libraries are unchanged by the patch).

	* inet/netinet/in.h (IPPROTO_MPLS): New enum value and macro.
	* sysdeps/unix/sysv/linux/bits/in.h (IP_BIND_ADDRESS_NO_PORT): New
	macro.

ChangeLog

@@ -1,5 +1,9 @@
 2015-09-01  Joseph Myers  <joseph@codesourcery.com>
 
+	* inet/netinet/in.h (IPPROTO_MPLS): New enum value and macro.
+	* sysdeps/unix/sysv/linux/bits/in.h (IP_BIND_ADDRESS_NO_PORT): New
+	macro.
+
 	* sysdeps/gnu/netinet/tcp.h (TCP_NOTSENT_LOWAT): New macro.
 	(TCP_CC_INFO): Likewise.
 	(TCP_SAVE_SYN): Likewise.

inet/netinet/in.h

@@ -85,6 +85,8 @@ enum
 #define IPPROTO_SCTP		IPPROTO_SCTP
     IPPROTO_UDPLITE = 136, /* UDP-Lite protocol.  */
 #define IPPROTO_UDPLITE		IPPROTO_UDPLITE
+    IPPROTO_MPLS = 137,    /* MPLS in IP.  */
+#define IPPROTO_MPLS		IPPROTO_MPLS
     IPPROTO_RAW = 255,	   /* Raw IP packets.  */
 #define IPPROTO_RAW		IPPROTO_RAW
     IPPROTO_MAX

sysdeps/unix/sysv/linux/bits/in.h

@@ -92,6 +92,7 @@
 #define IP_MINTTL       21
 #define IP_NODEFRAG     22
 #define IP_CHECKSUM     23
+#define IP_BIND_ADDRESS_NO_PORT 24
 
 /* IP_MTU_DISCOVER arguments.  */
 #define IP_PMTUDISC_DONT   0	/* Never send DF frames.  */