xtables-addons: fix build error with target x64

xtables-addons: fix build error with target x64

Fixes
make[6]: Entering directory '/Volumes/x64/openwrt/build_dir/target-x86_64_musl/linux-x86_64/linux-6.6.36'
  CC [M]  /Volumes/x64/openwrt/build_dir/target-x86_64_musl/linux-x86_64/xtables-addons-3.24/extensions/LUA/prot_buf_ip.o
In file included from /Volumes/x64/openwrt/build_dir/target-x86_64_musl/linux-x86_64/xtables-addons-3.24/extensions/LUA/prot_buf_ip.c:20:
./include/net/checksum.h: In function 'csum_shift':
./include/net/checksum.h:90:40: error: implicit declaration of function 'ror32' [-Werror=implicit-function-declaration]
   90 |                 return (__force __wsum)ror32((__force u32)sum, 8);
      |                                        ^~~~~
In file included from ./include/linux/kernel.h:22,
                 from ./include/linux/skbuff.h:13,
                 from ./include/linux/tcp.h:17,
                 from ./include/net/tcp.h:20,
                 from /Volumes/x64/openwrt/build_dir/target-x86_64_musl/linux-x86_64/xtables-addons-3.24/extensions/LUA/prot_buf_ip.c:21:
./include/linux/bitops.h: At top level:
./include/linux/bitops.h:135:21: error: conflicting types for 'ror32'; have '__u32(__u32,  unsigned int)' {aka 'unsigned int(unsigned int,  unsigned int)'}
  135 | static inline __u32 ror32(__u32 word, unsigned int shift)
      |                     ^~~~~
./include/net/checksum.h:90:40: note: previous implicit declaration of 'ror32' with type 'int()'
   90 |                 return (__force __wsum)ror32((__force u32)sum, 8);
      |                                        ^~~~~
cc1: some warnings being treated as errors

Signed-off-by: Georgi Valkov <redacted>