Upgrade fbjni

Summary:
Upgrades Yoga’s copy of *fbjni* to the latest version.

This will enable us

- to move from `finalize()` to `PhantomReference` to deallocate native memory, with the potential of making GC more efficient.
- to remove the internal dependency to *libfb,* allowing apps without an own dependency to ship less code

Reviewed By: passy

Differential Revision: D16220924

fbshipit-source-id: e8233fe2b5403946ff51f43cb6def558ded52fda

testutil/jni.cpp

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the LICENSE
  * file in the root directory of this source tree.
  */
-#include <fb/fbjni.h>
+#include <fbjni/fbjni.h>
 #include <yoga/testutil/testutil.h>
 
 using namespace facebook;