add cif_v1 and cif_export

zhuangzhong

2024-06-07 e700341244b02eb4116ba96d1b7faf42375dbe57

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add_library(csrc STATIC
        feature-fbank.cc
        feature-functions.cc
        feature-window.cc
        fftsg.c
        mel-computations.cc
        online-feature.cc
        rfft.cc)