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.in b/xlat/sysctl_net.in
index 37eda12..4e64a46 100644
--- a/xlat/sysctl_net.in
+++ b/xlat/sysctl_net.in
@@ -13,3 +13,9 @@
 NET_X25
 NET_TR
 NET_DECNET
+NET_ECONET
+NET_SCTP
+NET_LLC
+NET_NETFILTER
+NET_DCCP
+NET_IRDA