netfilter: remove unused #include <version.h>

The file(s) below do not use LINUX_VERSION_CODE nor KERNEL_VERSION.
  net/netfilter/nf_tproxy_core.c

This patch removes the said #include <version.h>.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/netfilter/nf_tproxy_core.c

@@ -10,7 +10,6 @@
  *
  */
 
-#include <linux/version.h>
 #include <linux/module.h>
 
 #include <linux/net.h>