uapi: ebtables: don't include linux/if.h

linux/if.h creates conflicts in userspace with net/if.h

By using it here we force userspace to use linux/if.h while
net/if.h may be needed.

Note that:

include/linux/netfilter_ipv4/ip_tables.h and
include/linux/netfilter_ipv6/ip6_tables.h

don't include linux/if.h and they also refer to IFNAMSIZ, so they are
expecting userspace to include use net/if.h from the client program.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/linux/netfilter_bridge/ebtables.h

@@ -12,9 +12,10 @@
 #ifndef __LINUX_BRIDGE_EFF_H
 #define __LINUX_BRIDGE_EFF_H
 
+#include <linux/if.h>
+#include <linux/if_ether.h>
 #include <uapi/linux/netfilter_bridge/ebtables.h>
 
-
 /* return values for match() functions */
 #define EBT_MATCH 0
 #define EBT_NOMATCH 1

include/uapi/linux/netfilter_bridge/ebtables.h

@@ -12,9 +12,7 @@
 
 #ifndef _UAPI__LINUX_BRIDGE_EFF_H
 #define _UAPI__LINUX_BRIDGE_EFF_H
-#include <linux/if.h>
 #include <linux/netfilter_bridge.h>
-#include <linux/if_ether.h>
 
 #define EBT_TABLE_MAXNAMELEN 32
 #define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN