move edge style properties to vanilla jni (YogaStyleProperties Part 4)

Summary: Move Yoga style properties to vanilla JNI under a flag.

Reviewed By: amir-shalem

Differential Revision: D17667201

fbshipit-source-id: 448134d6d7d0dd0c6ff2734b3eb39e65d1cb403f

java/jni/YGJNI.h

@@ -4,8 +4,6 @@
  * This source code is licensed under the MIT license found in the LICENSE
  * file in the root directory of this source tree.
  */
-#include <cstring>
-
 namespace {
 
 union YGNodeContext {