ipv4: NET_IPV4_ROUTE_GC_INTERVAL removal

removing obsoleted sysctl,
ip_rt_gc_interval variable no longer used since 2.6.38

Signed-off-by: Vasily Averin <vvs@sw.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index e8bffbe..6318b51 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -214,7 +214,7 @@
 	{ CTL_INT,	NET_IPV4_ROUTE_GC_MIN_INTERVAL,		"gc_min_interval" },
 	{ CTL_INT,	NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS,	"gc_min_interval_ms" },
 	{ CTL_INT,	NET_IPV4_ROUTE_GC_TIMEOUT,		"gc_timeout" },
-	{ CTL_INT,	NET_IPV4_ROUTE_GC_INTERVAL,		"gc_interval" },
+	/* NET_IPV4_ROUTE_GC_INTERVAL "gc_interval" no longer used */
 	{ CTL_INT,	NET_IPV4_ROUTE_REDIRECT_LOAD,		"redirect_load" },
 	{ CTL_INT,	NET_IPV4_ROUTE_REDIRECT_NUMBER,		"redirect_number" },
 	{ CTL_INT,	NET_IPV4_ROUTE_REDIRECT_SILENCE,	"redirect_silence" },