sysctl: update CTL_*, KERN_*, NET_*, and VM_* constants

* configure.ac (AC_CHECK_DECLS): Add CTL_*, KERN_*, NET_*, and
VM_* constants.
* system.c (CTL_PROC, CTL_CPU): Remove definitions.
* xlat/sysctl_*.in: Update.
diff --git a/xlat/sysctl_net_ipv4_conf.in b/xlat/sysctl_net_ipv4_conf.in
index 2adb2df..03ce527 100644
--- a/xlat/sysctl_net_ipv4_conf.in
+++ b/xlat/sysctl_net_ipv4_conf.in
@@ -9,3 +9,14 @@
 NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE
 NET_IPV4_CONF_BOOTP_RELAY
 NET_IPV4_CONF_LOG_MARTIANS
+NET_IPV4_CONF_TAG
+NET_IPV4_CONF_ARPFILTER
+NET_IPV4_CONF_MEDIUM_ID
+NET_IPV4_CONF_NOXFRM
+NET_IPV4_CONF_NOPOLICY
+NET_IPV4_CONF_FORCE_IGMP_VERSION
+NET_IPV4_CONF_ARP_ANNOUNCE
+NET_IPV4_CONF_ARP_IGNORE
+NET_IPV4_CONF_PROMOTE_SECONDARIES
+NET_IPV4_CONF_ARP_ACCEPT
+NET_IPV4_CONF_ARP_NOTIFY