this change is messy as whoever wrote the original code copied the GetBitContext instead of passing a pointer to it which has to be fixed for the above thing

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available to external programs as well.
Also make more things available to external programs like GET_UTF8, MKTAG etc.

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calculate all coefficients for several orders during cholesky factorization, the resulting coefficients are not strictly optimal though as there is a small difference in the autocorrelation matrixes which is ignored for the smaller orders

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based on patch by Víctor Paesa wzrlpy at arsystel com

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and similar since $libdir contained $prefix, which contained $(DESTDIR)..

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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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Originally committed as revision 5746 to svn://svn.ffmpeg.org/ffmpeg/trunk

Removes one of the last FIXMEs from the build system.

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of gnu extensions

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