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  this will find the coefficients which minimize the sum of the squared errors,
  levinson-durbin recursion OTOH is only strictly correct if the autocorrelation matrix is a
  toeplitz matrix which it is only if the blocksize is infinite, this is also why applying
  a window (like the welch winodw we currently use) improves the lpc coefficients generated
  by levinson-durbin recursion ...

optionally (use_lpc>2) support iterative linear least abs() solver using cholesky
  factorization with adjusted weights in each iteration

compression gain for both is small, and multiple passes are of course dead slow

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Removes one of the last FIXMEs from the build system.

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of gnu extensions

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patch by Víctor Paesa <wzrlpy at arsystel com>

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so recognize them as such.

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based on patch by Graham Booker <ffmpeglist at cod3r com>

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CONFIG_MINGW or __MINGW32__ instead.

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