[COMMITTED] BZ#18643: Add missing RFC3542 defines.

[Carlos O'Donell]

Trivial sync with latest kernel headers. Committed.

2015-07-08  Carlos O'Donell  <carlos@redhat.com>

	[BZ #18643]
	* sysdeps/unix/sysv/linux/bits/in.h: Define IPV6_RECVPATHMTU,
	IPV6_PATHMTU, and IPV6_DONTFRAG.

diff --git a/sysdeps/unix/sysv/linux/bits/in.h b/sysdeps/unix/sysv/linux/bits/in.h
index f684736..887719f 100644
--- a/sysdeps/unix/sysv/linux/bits/in.h
+++ b/sysdeps/unix/sysv/linux/bits/in.h
@@ -184,6 +184,7 @@ struct in_pktinfo
 #define IPV6_IPSEC_POLICY      34
 #define IPV6_XFRM_POLICY       35
 
+/* Advanced API (RFC3542) (1).  */
 #define IPV6_RECVPKTINFO       49
 #define IPV6_PKTINFO           50
 #define IPV6_RECVHOPLIMIT      51
@@ -195,7 +196,11 @@ struct in_pktinfo
 #define IPV6_RTHDR             57
 #define IPV6_RECVDSTOPTS       58
 #define IPV6_DSTOPTS           59
+#define IPV6_RECVPATHMTU       60
+#define IPV6_PATHMTU           61
+#define IPV6_DONTFRAG          62
 
+/* Advanced API (RFC3542) (2).  */
 #define IPV6_RECVTCLASS                66
 #define IPV6_TCLASS            67