Ignore more libcore.java.util.zip test failures with CC.

These tests sometimes fail with a
java.util.concurrent.TimeoutException on ART Builbot's
x86-64 concurrent collector configuration:
* libcore.java.util.zip.DeflaterOutputStreamTest#testSyncFlushDisabled
* libcore.java.util.zip.OldAndroidGZIPStreamTest#testGZIPStream

Disable them while we investigate.

Bug: 26507762
Change-Id: If62d5d6491c2808a37dabc6f5c48464d5ed1dfbd
diff --git a/tools/libcore_failures_concurrent_collector.txt b/tools/libcore_failures_concurrent_collector.txt
index 2cb2c50..e55c000 100644
--- a/tools/libcore_failures_concurrent_collector.txt
+++ b/tools/libcore_failures_concurrent_collector.txt
@@ -27,7 +27,9 @@
   description: "TimeoutException on host-{x86,x86-64}-concurrent-collector",
   result: EXEC_FAILED,
   modes: [host],
-  names: ["libcore.java.util.zip.GZIPOutputStreamTest#testSyncFlushEnabled",
+  names: ["libcore.java.util.zip.DeflaterOutputStreamTest#testSyncFlushDisabled",
+          "libcore.java.util.zip.GZIPOutputStreamTest#testSyncFlushEnabled",
+          "libcore.java.util.zip.OldAndroidGZIPStreamTest#testGZIPStream",
           "libcore.java.util.zip.ZipFileTest#testZipFileWithLotsOfEntries",
           "libcore.java.util.zip.ZipInputStreamTest#testLongMessage"],
   bug: 26507762