Add test to expected failures.

Bug: 176104885
Test: libcore.android.system.OsTest#test_socket_setSockoptTimeval_effective
Change-Id: I9e67cc9ff8648db4dfb7e78c266e830ae8540c1a
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index 1280038..67c0275 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -283,5 +283,12 @@
           "libcore.javax.net.ssl.DefaultHostnameVerifierTest#testSubjectWithWildAltNamesCert",
           "libcore.javax.net.ssl.DefaultHostnameVerifierTest#testWildAltNameOnlyCert"],
   bug: 166619732
+},
+{
+  description: "Doesn't work on old kernels (like on fugu)",
+  result: EXEC_FAILED,
+  modes: [device],
+  bug: 176104885,
+  names: ["libcore.android.system.OsTest#test_socket_setSockoptTimeval_effective"]
 }
 ]