[IPV4]: Module export of ip_rcv() no longer needed.

With ip_rcv nowhere outside the IP stack being used anymore it's
EXPORT_SYMBOL is not needed any longer either.
Signed-off-by: Ralf Baechle DL5RB <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ip_input.c

@@ -442,5 +442,4 @@ out:
         return NET_RX_DROP;
 }
 
-EXPORT_SYMBOL(ip_rcv);
 EXPORT_SYMBOL(ip_statistics);