[NETFILTER]: nf_conntrack_h323: fix compile error with CONFIG_IPV6=m, CONFIG_NF_CONNTRACK_H323=y

Fix this by letting NF_CONNTRACK_H323 depend on (IPV6 || IPV6=n).
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/Kconfig

@@ -165,7 +165,7 @@ config NF_CONNTRACK_FTP
 
 config NF_CONNTRACK_H323
 	tristate "H.323 protocol support (EXPERIMENTAL)"
-	depends on EXPERIMENTAL && NF_CONNTRACK
+	depends on EXPERIMENTAL && NF_CONNTRACK && (IPV6 || IPV6=n)
 	help
 	  H.323 is a VoIP signalling protocol from ITU-T. As one of the most
 	  important VoIP protocols, it is widely used by voice hardware and