Fix all remaining warnings (missing declarations, missing prototypes)
diff --git a/iptables-xml.c b/iptables-xml.c
index 94f2e39..d922efe 100644
--- a/iptables-xml.c
+++ b/iptables-xml.c
@@ -16,6 +16,7 @@
 #include <stdarg.h>
 #include "iptables.h"
 #include "libiptc/libiptc.h"
+#include "iptables-multi.h"
 
 #ifdef DEBUG
 #define DEBUGP(x, args...) fprintf(stderr, x, ## args)