update infer func for old contextual

shixian.shi

2023-07-06 5690a8bcb314ee53a5db1c704f6e3fe61460c7f6

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add_subdirectory(csrc)
 
if(KALDI_NATIVE_FBANK_BUILD_PYTHON)
  message(STATUS "Building Python")
  add_subdirectory(python)
else()
  message(STATUS "Disable building Python")
endif()