Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/linux/rtnetlink.h b/libc/kernel/uapi/linux/rtnetlink.h
index 103ff5d..d094068 100644
--- a/libc/kernel/uapi/linux/rtnetlink.h
+++ b/libc/kernel/uapi/linux/rtnetlink.h
@@ -111,6 +111,8 @@
 #define RTM_SETDCB RTM_SETDCB
   RTM_NEWNETCONF = 80,
 #define RTM_NEWNETCONF RTM_NEWNETCONF
+  RTM_DELNETCONF,
+#define RTM_DELNETCONF RTM_DELNETCONF
   RTM_GETNETCONF = 82,
 #define RTM_GETNETCONF RTM_GETNETCONF
   RTM_NEWMDB = 84,
@@ -237,6 +239,7 @@
   RTA_EXPIRES,
   RTA_PAD,
   RTA_UID,
+  RTA_TTL_PROPAGATE,
   __RTA_MAX
 };
 #define RTA_MAX (__RTA_MAX - 1)
@@ -253,6 +256,7 @@
 #define RTNH_F_ONLINK 4
 #define RTNH_F_OFFLOAD 8
 #define RTNH_F_LINKDOWN 16
+#define RTNH_F_UNRESOLVED 32
 #define RTNH_COMPARE_MASK (RTNH_F_DEAD | RTNH_F_LINKDOWN | RTNH_F_OFFLOAD)
 #define RTNH_ALIGNTO 4
 #define RTNH_ALIGN(len) (((len) + RTNH_ALIGNTO - 1) & ~(RTNH_ALIGNTO - 1))
@@ -393,6 +397,7 @@
   TCA_STATS2,
   TCA_STAB,
   TCA_PAD,
+  TCA_DUMP_INVISIBLE,
   __TCA_MAX
 };
 #define TCA_MAX (__TCA_MAX - 1)
@@ -486,6 +491,8 @@
 #define RTNLGRP_MPLS_ROUTE RTNLGRP_MPLS_ROUTE
   RTNLGRP_NSID,
 #define RTNLGRP_NSID RTNLGRP_NSID
+  RTNLGRP_MPLS_NETCONF,
+#define RTNLGRP_MPLS_NETCONF RTNLGRP_MPLS_NETCONF
   __RTNLGRP_MAX
 };
 #define RTNLGRP_MAX (__RTNLGRP_MAX - 1)