Compile libFLAC with associative floating-point math #476
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ktmf01
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Also, fix a bug in which apodization windows were not recalculated when blocksize was shrunk
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As lag is one larger than the LPC order, also do not use intrinsics when data_len == 32
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This PR tries to improve like #473. I closed that one because it came to my attention linking with -ffast-math would result in 'infectious' flush-to-zero or denormals-are-zero behavior extending beyond the confines of libFLAC, affecting programs linking to libFLAC. See https://simonbyrne.github.io/notes/fastmath/#flushing_subnormals_to_zero
So, this PR achieves the same speed-up but without affecting programs linked against libFLAC.