No ipt in xt

Cease using ipt_entry_match (replaced by xt_entry_match).

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
diff --git a/extensions/libxt_connlimit.c b/extensions/libxt_connlimit.c
index 58faa11..434eab2 100644
--- a/extensions/libxt_connlimit.c
+++ b/extensions/libxt_connlimit.c
@@ -24,7 +24,7 @@
 	{NULL},
 };
 
-static void connlimit_init(struct ipt_entry_match *match)
+static void connlimit_init(struct xt_entry_match *match)
 {
 	struct xt_connlimit_info *info = (void *)match->data;
 	info->v4_mask = 0xFFFFFFFFUL;