Fixed unused local variable warning.

android-project/src/org/libsdl/app/SDLActivity.java

@@ -270,7 +270,7 @@ public class SDLActivity extends Activity {
     }
 
     // C functions we call
-    public static native void nativeInit();
+    public static native int nativeInit();
     public static native void nativeLowMemory();
     public static native void nativeQuit();
     public static native void nativePause();

src/main/android/SDL_android_main.c

@@ -17,7 +17,7 @@
 extern void SDL_Android_Init(JNIEnv* env, jclass cls);
 
 /* Start up the SDL app */
-void Java_org_libsdl_app_SDLActivity_nativeInit(JNIEnv* env, jclass cls, jobject obj)
+int Java_org_libsdl_app_SDLActivity_nativeInit(JNIEnv* env, jclass cls, jobject obj)
 {
     /* This interface could expand with ABI negotiation, calbacks, etc. */
     SDL_Android_Init(env, cls);
@@ -33,6 +33,8 @@ void Java_org_libsdl_app_SDLActivity_nativeInit(JNIEnv* env, jclass cls, jobject
 
     /* Do not issue an exit or the whole application will terminate instead of just the SDL thread */
     /* exit(status); */
+
+    return status;
 }
 
 #endif /* __ANDROID__ */