CheckVoiceData.java: don't use the deprecated EXTRA_CHECK_VOICE_DATA_FOR value

This is used to filter the list of languages returned. However, the
filtering is not needed on the engine side as the client can simply
enumerate through all the available voices instead.

android/src/com/reecedunn/espeak/CheckVoiceData.java

 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
-import android.speech.tts.TextToSpeech;
 import android.speech.tts.TextToSpeech.Engine;
 import android.util.Log;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Set;
             availableLanguages.add(voice.toString());
         }
 
-        final ArrayList<String> checkFor = getIntent().getStringArrayListExtra(
-                TextToSpeech.Engine.EXTRA_CHECK_VOICE_DATA_FOR);
-
-        if (checkFor != null && !checkFor.isEmpty()) {
-            final Set<String> checkForSet = new HashSet<String>(checkFor);
-
-            availableLanguages = filter(availableLanguages, checkForSet);
-            unavailableLanguages = filter(unavailableLanguages, checkForSet);
-        }
-
         returnResults(Engine.CHECK_VOICE_DATA_PASS, dataPath, availableLanguages,
                       unavailableLanguages);
     }