clat: switch to relative cbpf filter

Needed to support AF_PACKET/SOCK_RAW sockets

Test: TreeHugger, ping on ipv6-only wifi works
Bug: 265591307
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: If324ee1e97a90b1a0a2ee0fabe1d91ef0603fdac
diff --git a/service/native/libs/libclat/Android.bp b/service/native/libs/libclat/Android.bp
index 54d40ac..996706e 100644
--- a/service/native/libs/libclat/Android.bp
+++ b/service/native/libs/libclat/Android.bp
@@ -23,6 +23,9 @@
         "clatutils.cpp",
     ],
     stl: "libc++_static",
+    header_libs: [
+        "bpf_headers",
+    ],
     static_libs: [
         "libip_checksum",
     ],