Revert back to temporarily disable AS wrapper for 64-bit ARM platform.

The earlier commit lacks the inclusion of logic to enable C++11 standard and boost preprocessor library. However, after locally tested it, it appears that Android NDK 4.9 is not able to able handle it. Need more time to experiment with it in another branch first.
[ci only: Android, OSX] [skip appveyor]

Source/ThirdParty/AngelScript/include/angelscript.h

@@ -39,8 +39,8 @@
 #ifndef ANGELSCRIPT_H
 #define ANGELSCRIPT_H
 
-// Urho3D: Define AS_MAX_PORTABILITY for Web and 64-bit ARM platforms
-#if defined(__EMSCRIPTEN__) || defined(__aarch64__)
+// Urho3D: Define AS_MAX_PORTABILITY for Web
+#if defined(__EMSCRIPTEN__)
 #define AS_MAX_PORTABILITY
 #endif