netfilter: fix compilation of the nfnl_cthelper if NF_CONNTRACK is unset

This patch fixes the compilation of net/netfilter/nfnetlink_cthelper.c
if CONFIG_NF_CONNTRACK is not set.

This patch also moves the definition of the cthelper infrastructure to
the scope of NF_CONNTRACK things.

I have also renamed NETFILTER_NETLINK_CTHELPER by NF_CT_NETLINK_HELPER,
to use similar names to other nf_conntrack_netlink extensions. Better now
that this has been only for two days in David's tree.

Two new dependencies have been added:

* NF_CT_NETLINK
* NETFILTER_NETLINK_QUEUE

Since these infrastructure requires both ctnetlink and nfqueue.

Reported-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index aae6c62..f1a52ba 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -12,14 +12,6 @@
 	  If this option is enabled, the kernel will include support
 	  for extended accounting via NFNETLINK.
 
-config NETFILTER_NETLINK_CTHELPER
-tristate "Netfilter CTHELPER over NFNETLINK interface"
-	depends on NETFILTER_ADVANCED
-	select NETFILTER_NETLINK
-	help
-	  If this option is enabled, the kernel will include support
-	  for user-space connection tracking helpers via NFNETLINK.
-
 config NETFILTER_NETLINK_QUEUE
 	tristate "Netfilter NFQUEUE over NFNETLINK interface"
 	depends on NETFILTER_ADVANCED
@@ -343,6 +335,18 @@
 
 	  If unsure, say `N'.
 
+config NF_CT_NETLINK_HELPER
+	tristate 'Connection tracking helpers in user-space via Netlink'
+	select NETFILTER_NETLINK
+	depends on NF_CT_NETLINK
+	depends on NETFILTER_NETLINK_QUEUE
+	depends on NETFILTER_ADVANCED
+	help
+	  This option enables the user-space connection tracking helpers
+	  infrastructure.
+
+	  If unsure, say `N'.
+
 endif # NF_CONNTRACK
 
 # transparent proxy support