Make native method binding configurable

Summary:
Moves binding of native methods into a separate native method that can be parameterized.

This will be used to experiment with JNI-related technology.

Reviewed By: priteshrnandgaonkar

Differential Revision: D9943870

fbshipit-source-id: 661f15537d5bbf7a3eef7717e3d99fed2de23904

java/com/facebook/yoga/YogaConfig.java

@@ -16,7 +16,7 @@ public class YogaConfig {
   public static int SPACING_TYPE = 1;
 
   static {
-      SoLoader.loadLibrary("yoga");
+      YogaJNI.init();
   }
 
   long mNativePointer;