move percent auto style properties to vanilla jni (YogaStyleProperties Part 3)

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

Reviewed By: amir-shalem

Differential Revision: D17666674

fbshipit-source-id: 08490bf7c214c856a93214088a27dd4e6df9e0fd

java/jni/YGJNI.h

@@ -4,6 +4,8 @@
  * 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 {