remove never use code (#1151)

夜雨飘零

2023-12-06 6f88a689af05dee063d52fc65806cb0addbb764b

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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)