Certain optimisations that TensorFlow recommends cause significant
performance penalties in c_speech_features. Explicitly disable these
features in the BUILD file only for c_speech_features.
The build has been restructured to produce a single deepspeech library,
rather than 3 separate deepspeech, c_speech_features and kissfft
libaries. This should make the deepspeech client and libraries
significantly easier to use and distribute.