Fix issues with running test in open source

Summary: Travis builds have been broken for a while. This diff fixes some of the issues surrounding bad buck file configuration as well as missing jni.h file.

Reviewed By: astreet

Differential Revision: D4148724

fbshipit-source-id: 1e284db61280326a4bcbb9337e804a4804348aa6

lib/jni/jni.h

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#pragma once
+
+#ifdef __ANDROID__
+#include_next <jni.h>
+#else
+#include "real/jni.h"
+#endif