I don't understand why it was necessary.
on some devices, the binary is in a different location. if this is still needed for something, we need
to search for chmod binary dynamicly

this is the maximum espeak-ng's speech rate without using libsonic

1: Added missing voice variants in the NVDA category including Iven 4, Steph, Steph 2 and Steph 3.
2: Completed the Persian translation.

This is caused by the Voice features being set to null. The fix in
Android Marshmallow is to make onGetFeaturesForLanguage return an
empty HashSet object. This does not work for eSpeak because:

  1.  eSpeak was overriding onGetVoices and initializing each Voice's
      features to null;

  2.  the bug is still present on Lollipop.

Thus, the fix here is two-fold:

  1.  make onGetVoices use onGetFeaturesForLanguage;

  2.  make onGetFeaturesForLanguage return an empty HashSet, so that
      eSpeak does not crash on Lollipop either.

When there is no TTS engine selected, mTts.getVoice() will throw
a NullPointerException. This is a workaround to cope with this bug
in Android.

This reverts commit 6ac54860a1.

This change was preventing the voice data from being installed.