Build and run the zlib tests.

Test: treehugger
Change-Id: I54325dc988c41942c9969cea520ba0222c51106d
diff --git a/TEST_MAPPING b/TEST_MAPPING
index d69ed96..e4164ec 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -18,6 +18,9 @@
       "name": "ziparchive-tests"
     },
     {
+      "name": "zlib_tests"
+    },
+    {
       "name": "CtsLibcoreTestCases",
       "options": [
         {