fix compile error in the netfilter ipset module

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7318 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic-2.6/patches/013-ipset_compile_fix.patch

@@ -0,0 +1,10 @@
+--- linux.old/include/linux/netfilter_ipv4/ip_set_malloc.h	2007-05-23 23:34:49.100660208 +0200
++++ linux.dev/include/linux/netfilter_ipv4/ip_set_malloc.h	2007-05-23 23:36:36.528328720 +0200
+@@ -2,6 +2,7 @@
+ #define _IP_SET_MALLOC_H
+ 
+ #ifdef __KERNEL__
++#include <asm/pgtable.h>
+ 
+ /* Memory allocation and deallocation */
+ static size_t max_malloc_size = 0;