sysctl: ipv4 remove binary sysctl paths where they are broken

Currently tcp_available_congestion_control does not even attempt being read
from sys_sysctl, and ipfrag_max_dist while it works allows setting of invalid
values using sys_sysctl.

So just kill the binary sys_sysctl support for these sysctls.  If the support
is not important enough to test and get right it probably isn't important
enough to keep.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Cc: Alexey Dobriyan <adobriyan@sw.ru>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

net/ipv4/sysctl_net_ipv4.c

@@ -740,7 +740,6 @@ ctl_table ipv4_table[] = {
 		.strategy	= &sysctl_jiffies
 	},
 	{
-		.ctl_name	= NET_IPV4_IPFRAG_MAX_DIST,
 		.procname	= "ipfrag_max_dist",
 		.data		= &sysctl_ipfrag_max_dist,
 		.maxlen		= sizeof(int),
@@ -865,7 +864,6 @@ ctl_table ipv4_table[] = {
 	},
 #endif /* CONFIG_NETLABEL */
 	{
-		.ctl_name	= NET_TCP_AVAIL_CONG_CONTROL,
 		.procname	= "tcp_available_congestion_control",
 		.maxlen		= TCP_CA_BUF_MAX,
 		.mode		= 0444,