Update kaldi-native-fbank. (#2259)

Now it supports FFT of an even number, not necessarily a power of 2.

sherpa-onnx/csrc/features.h

@@ -79,6 +79,8 @@ struct FeatureExtractorConfig {
 
   bool is_mfcc = false;
 
+  bool round_to_power_of_two = true;
+
   std::string ToString() const;
 
   void Register(ParseOptions *po);