CheckVoiceData.java: use CHECK_VOICE_DATA_FAIL instead of CHECK_VOICE_DATA_MISSING_DATA to fix a deprecated warning using API 18.

android/project.properties

@@ -8,4 +8,4 @@
 # project structure.
 
 # Project target.
-target=android-17
+target=android-18

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

@@ -111,7 +111,7 @@ public class CheckVoiceData extends Activity {
             if (!haveBaseResources) {
                 unavailableLanguages.add(Locale.ENGLISH.toString());
             }
-            returnResults(Engine.CHECK_VOICE_DATA_MISSING_DATA, dataPath, availableLanguages,
+            returnResults(Engine.CHECK_VOICE_DATA_FAIL, dataPath, availableLanguages,
                           unavailableLanguages);
             return;
         }