Fixes warning on compilation of iptables matches/targets

This changes the type of arguments as follows
- ipt_ip * -> void *
- ipt_entry * -> void *

This patch doesn't change multiport, DNAT, SNAT, MASQUERADE, REDIRECT
because these need more changes (casting void * variable with intended type)
diff --git a/extensions/libipt_connbytes.c b/extensions/libipt_connbytes.c
index c59f9be..69b39bd 100644
--- a/extensions/libipt_connbytes.c
+++ b/extensions/libipt_connbytes.c
@@ -49,7 +49,7 @@
    ate an option */
 static int
 parse(int c, char **argv, int invert, unsigned int *flags,
-      const struct ipt_entry *entry,
+      const void *entry,
       unsigned int *nfcache,
       struct xt_entry_match **match)
 {
@@ -146,7 +146,7 @@
 
 /* Prints out the matchinfo. */
 static void
-print(const struct ipt_ip *ip,
+print(const void *ip,
       const struct xt_entry_match *match,
       int numeric)
 {
@@ -167,7 +167,7 @@
 }
 
 /* Saves the matchinfo in parsable form to stdout. */
-static void save(const struct ipt_ip *ip, const struct xt_entry_match *match)
+static void save(const void *ip, const struct xt_entry_match *match)
 {
 	struct ipt_connbytes_info *sinfo = (struct ipt_connbytes_info *)match->data;