Removed now-unused ArrayAdapterCompat class.

app/src/main/java/org/fdroid/fdroid/compat/ArrayAdapterCompat.java

@@ -1,22 +0,0 @@
-package org.fdroid.fdroid.compat;
-
-import android.annotation.TargetApi;
-import android.os.Build;
-import android.widget.ArrayAdapter;
-
-import java.util.List;
-
-public class ArrayAdapterCompat {
-
-    @TargetApi(11)
-    public static <T> void addAll(ArrayAdapter<T> adapter, List<T> list) {
-        if (Build.VERSION.SDK_INT >= 11) {
-            adapter.addAll(list);
-        } else {
-            for (T category : list) {
-                adapter.add(category);
-            }
-        }
-    }
-
-}