add Lernout & Hauspie audio decoder

[ami_stuff]

this codec was a part of NetShow package

​https://education.siggraph.org/static/HyperGraph/video/architectures/NetShow.html

./ffmpeg -i Lernout_and_Hauspie_8kHz_16bit_mono_SBC_8kbit_s.wav 
ffmpeg version N-109867-g5247dab6b1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: 
  libavutil      58.  1.100 / 58.  1.100
  libavcodec     60.  2.100 / 60.  2.100
  libavformat    60.  2.100 / 60.  2.100
  libavdevice    60.  0.100 / 60.  0.100
  libavfilter     9.  1.100 /  9.  1.100
  libswscale      7.  0.100 /  7.  0.100
  libswresample   4.  9.100 /  4.  9.100
[wav @ 0x561ee0e58400] Estimating duration from bitrate, this may be inaccurate
[wav @ 0x561ee0e58400] Could not find codec parameters for stream 0 (Audio: none (q[0][0][0] / 0x0071), 8000 Hz, 1 channels, 14 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, wav, from 'Lernout_and_Hauspie_8kHz_16bit_mono_SBC_8kbit_s.wav':
  Duration: 00:00:05.70, bitrate: 14 kb/s
  Stream #0:0: Audio: none (q[0][0][0] / 0x0071), 8000 Hz, 1 channels, 14 kb/s
At least one output file must be specified