readd netfilter headers

Author: gnzlbg

libc-test/build.rs

@@ -2361,6 +2361,8 @@ fn test_linux(target: &str) {
         "linux/input.h",
         "linux/module.h",
         "linux/net_tstamp.h",
+        "linux/netfilter_ipv4.h",
+        "linux/netfilter_ipv6.h",
         "linux/netlink.h",
         "linux/random.h",
         "linux/seccomp.h",