Adapted from SPTK v3.11

[r9y9]

Changes from v3.11: http://sp-tk.sourceforge.net/

Unfortunetely there's no commit history available for v3.11 on either
svn or git. Since it's hard to pick every fix safely, I decided to pick
changes for 6-th and 7-th pade approximation for mlsadf, mglsadf, etc.
Other changes described in 3.11 NEW (e.g., bug fixes! not sure what bugs
were fixed) are not included.

I did the following shell:

#!/bin/bash

SPTK=../SPTK-3.11

for cmd in acep amcep glsadf lmadf lmadf mglsadf mlsadf
do
    cp -v $SPTK/bin/$cmd/_$cmd.c ./bin/$cmd/
done