fix l2tpns compile

package/l2tpns/patches/patch-l2tpns_c

@@ -1,6 +1,22 @@
 $Id: update-patches 24 2008-08-31 14:56:13Z wbx $
 --- l2tpns-2.1.21.orig/l2tpns.c	2006-06-22 17:30:50.000000000 +0200
-+++ l2tpns-2.1.21/l2tpns.c	2009-05-29 17:53:32.393095004 +0200
++++ l2tpns-2.1.21/l2tpns.c	2013-07-16 17:39:13.000000000 +0200
+@@ -10,6 +10,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns
+ #include <assert.h>
+ #include <errno.h>
+ #include <fcntl.h>
++#include <stdio.h>
+ #include <linux/if_tun.h>
+ #define SYSLOG_NAMES
+ #include <syslog.h>
+@@ -22,7 +23,6 @@ char const *cvs_id_l2tpns = "$Id: l2tpns
+ #include <netinet/ip6.h>
+ #include <stdarg.h>
+ #include <stdlib.h>
+-#include <stdio.h>
+ #include <string.h>
+ #include <ctype.h>
+ #include <sys/ioctl.h>
 @@ -4233,31 +4233,6 @@ int main(int argc, char *argv[])
  		chdir("/tmp");
  	}