nat46: Fix compile with kernel 5.4

nf_reset() was renamed to nf_reset_ct() in upstream Linux commit
895b5c9f206e ("netfilter: drop bridge nf reset from nf_reset)"

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/kernel/nat46/patches/100-kernel-5.4-compat.patch

@@ -0,0 +1,34 @@
+--- a/nat46/modules/nat46-core.c
++++ b/nat46/modules/nat46-core.c
+@@ -17,6 +17,7 @@
+  */
+ 
+ #include <net/route.h>
++#include <linux/version.h>
+ 
+ #include "nat46-glue.h"
+ #include "nat46-core.h"
+@@ -1598,7 +1599,11 @@ void nat46_ipv6_input(struct sk_buff *ol
+   /* Remove any debris in the socket control block */
+   memset(IPCB(new_skb), 0, sizeof(struct inet_skb_parm));
+   /* Remove netfilter references to IPv6 packet, new netfilter references will be created based on IPv4 packet */
++#if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
+   nf_reset(new_skb);
++#else
++  nf_reset_ct(new_skb);
++#endif
+ 
+   /* modify packet: actual IPv6->IPv4 transformation */
+   truncSize = v6packet_l3size - sizeof(struct iphdr); /* chop first 20 bytes */
+@@ -1803,7 +1808,11 @@ void nat46_ipv4_input(struct sk_buff *ol
+   /* Remove any debris in the socket control block */
+   memset(IPCB(new_skb), 0, sizeof(struct inet_skb_parm));
+   /* Remove netfilter references to IPv4 packet, new netfilter references will be created based on IPv6 packet */
++#if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
+   nf_reset(new_skb);
++#else
++  nf_reset_ct(new_skb);
++#endif
+ 
+   /* expand header (add 20 extra bytes at the beginning of sk_buff) */
+   pskb_expand_head(new_skb, IPV6V4HDRDELTA + (add_frag_header?8:0), 0, GFP_ATOMIC);