[android] - replace platform default implementation using nunicode for uppercasing an lowercasing with an Android specific String.java equivalent

platform/android/src/jni.cpp

@@ -187,6 +187,7 @@ void registerNatives(JavaVM *vm) {
     LocalGlyphRasterizer::registerNative(env);
     Locale::registerNative(env);
     Collator::registerNative(env);
+    StringUtils::registerNative(env);
 
     // Logger
     Logger::registerNative(env);