Fix module build for Linux v6.12

adapt to "move asm/unaligned.h to linux/unaligned.h"
(5f60d5f6bbc12e782fac78110b0ee62698f3b576) in v6.12-rc2

Fixes: #237
Signed-off-by: Andreas Beckmann <anbe@debian.org>

Author: anbe42

gen_compat_def

@@ -64,7 +64,7 @@ kbuild_test_symbol() {
   echo -n "Test function $* " >&2
   kbuild_test_compile ${1^^} $1 ${2-} <<-EOF
 	#include <linux/module.h>
-	${2:+#include <$2>}
+	${3:-${2:+#include <$2>}}
 	MODULE_LICENSE("GPL");
 	void *test = $1;
 	EOF
@@ -121,7 +121,12 @@ kbuild_test_symbol nf_bridge_info_get linux/netfilter_bridge.h
 # Stumbled on 5.9
 kbuild_test_struct vlan_dev_priv linux/if_vlan.h
 # Kernel version check broken by centos8
-kbuild_test_symbol put_unaligned_be24 asm/unaligned.h
+kbuild_test_symbol put_unaligned_be24 '???/unaligned.h' '#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,12,0)
+#include <linux/unaligned.h>
+#else
+#include <asm/unaligned.h>
+#endif'
 # totalram_pages changed from atomic to inline function.
 kbuild_test_symbol totalram_pages linux/mm.h
 kbuild_test_ref    totalram_pages linux/mm.h

ipt_NETFLOW.c

@@ -68,7 +68,11 @@
 # include <net/netfilter/nf_conntrack_core.h>
 #endif
 #include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,12,0)
+#include <linux/unaligned.h>
+#else
 #include <asm/unaligned.h>
+#endif
 #ifdef HAVE_LLIST
 	/* llist.h is officially defined since linux 3.1,
 	 * but centos6 have it backported on its 2.6.32.el6 */