Fixed build with older Android SDK

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

@@ -4,7 +4,6 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.util.Arrays;
 import java.lang.reflect.Method;
-import java.util.Objects;
 
 import android.app.*;
 import android.content.*;

android-project/app/src/main/java/org/libsdl/app/SDLControllerManager.java

@@ -4,7 +4,6 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
-import java.util.Objects;
 
 import android.content.Context;
 import android.os.*;