Depend on libipchecksum, not libnetutils.

clatd depends on libnetutils but it only actually uses the
IP checksumming functions. Depend on libipchecksum instead.

The unit test still depends on libnetutils because it uses
libnetd_test_tun_interface, which calls into libnetutils.

Test: m
Test: atest clatd_test
Test: builds, boots, connects to IPv6-only wifi
Change-Id: I4f12e09f78a01d6df8b11a0c9e92c25c9d7a1248
diff --git a/Android.bp b/Android.bp
index c6961de..6df3078 100644
--- a/Android.bp
+++ b/Android.bp
@@ -65,11 +65,13 @@
         ":clatd_common",
         "main.c"
     ],
-    static_libs: ["libnl"],
+    static_libs: [
+        "libipchecksum",
+        "libnl",
+    ],
     shared_libs: [
         "libcutils",
         "liblog",
-        "libnetutils",
     ],
 
     // Only enable clang-tidy for the daemon, not the tests, because enabling it for the
@@ -104,6 +106,7 @@
     ],
     static_libs: [
         "libbase",
+        "libipchecksum",
         "libnetd_test_tun_interface",
         "libnl",
     ],