Android: remove app_dummy() calls

Change-Id: I0ebd4502f98d009ce5afe8c8bafb629284f0366c

android/jni/main.cpp

@@ -18,9 +18,6 @@
 
 extern int main(int argc, char **argv);
 
-void android_main(android_app *app) {
-  // Make sure glue isn't stripped.
-  app_dummy();
-
+void android_main(android_app *) {
   main(0, NULL);
 }

samples/android/jni/main.cpp

@@ -17,9 +17,7 @@
 #include "android_native_app_glue.h"
 #include "animal_generated.h" // Includes "flatbuffers/flatbuffers.h".
 
-void android_main(android_app *app) {
-  app_dummy();
-
+void android_main(android_app *) {
   flatbuffers::FlatBufferBuilder builder;
   auto name = builder.CreateString("Dog");
   auto sound = builder.CreateString("Bark");