Android: Prevent instantiation of utility classes

Source/Android/src/org/dolphinemu/dolphinemu/NativeLibrary.java

@@ -53,6 +53,11 @@ public final class NativeLibrary
 		public static final int PRESSED = 1;
 	}
 
+	private NativeLibrary()
+	{
+		// Disallows instantiation.
+	}
+
 	/**
 	 * Default touchscreen device
 	 */

Source/Android/src/org/dolphinemu/dolphinemu/settings/UserPreferences.java

@@ -21,6 +21,11 @@ import android.preference.PreferenceManager;
  */
 public final class UserPreferences
 {
+	private UserPreferences()
+	{
+		// Disallows instantiation.
+	}
+
 	/**
 	 * Loads the settings stored in the Dolphin ini config files to the shared preferences of this front-end.
 	 *