Optimize memory (#612)

lingyunfly

2023-06-09 6bdae5723e403584ee3507675b3e4e922a34f246

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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)