Ignore DeflaterOutputStreamTest#testSyncFlushEnabled failures with CC.

This test sometimes fails with a
java.util.concurrent.TimeoutException on ART Builbot's
x86 concurrent collector configuration:
* libcore.java.util.zip.DeflaterOutputStreamTest#testSyncFlushEnabled

Disable it while we investigate.

Bug: 26507762
Change-Id: I4f026c20a555f985a17bf785606cae53f3f804d3
diff --git a/tools/libcore_failures_concurrent_collector.txt b/tools/libcore_failures_concurrent_collector.txt
index 95d1292..3f57e3a 100644
--- a/tools/libcore_failures_concurrent_collector.txt
+++ b/tools/libcore_failures_concurrent_collector.txt
@@ -27,7 +27,8 @@
   description: "TimeoutException on host-{x86,x86-64}-concurrent-collector",
   result: EXEC_FAILED,
   modes: [host],
-  names: ["libcore.java.util.zip.DeflaterOutputStreamTest#testSyncFlushDisabled",
+  names: ["libcore.java.util.zip.DeflaterOutputStreamTest#testSyncFlushEnabled",
+          "libcore.java.util.zip.DeflaterOutputStreamTest#testSyncFlushDisabled",
           "libcore.java.util.zip.GZIPOutputStreamTest#testSyncFlushEnabled",
           "libcore.java.util.zip.OldAndroidGZIPStreamTest#testGZIPStream",
           "libcore.java.util.zip.OldAndroidZipStreamTest#testZipStream",