Log message:
Update sptk to 3.5.
PR 46047 by ISHIHARA Takanori.

Version 3.5:
 * add 'dtw' command.
 * add 'mfcc' command.
 * add 'mgc2mgclsp' and 'mgclsp2mgc' command.
 * add two pitch extraction algorithm, 'RAPT' and 'SWIPE' to 'pitch' command.
 * add -R and -M option to 'delta' command, to skip the magic number during the
   calculation.
 * unify data type for sampling frequency into float in kHz.
 * fix options of 'psgr' and 'grlogsp' command to draw more large graph.
 * fix 'wav2raw' to deal with IEEE float format.
 * bug fixes.

Log message:
Explicitly disable da (audio output).

Log message:
Update sptk to 3.4.1.
In addition to PR#45024 by ISIHARA Takanori,
* also update refrence manual and examples PDF document files.
* exactly depend on csh, some installed scripts are csh script.

Version 3.4.1:
 * add 'idct' command.
 * remove all input/output data type except float from 'frame', 'snr', 'us16',
   and 'uscd' command.
 * add input/output data type to many commands.
 * show number of byte for all input/output data type in 'x2x' command.
 * rename 'pcap' command to 'pcas' command.
 * add new constant (octave and cent) to 'sopr' command.
 * bug fixes.

Log message:
Import sptk-3.4 as audio/sptk.
Based on PR#44556 by ISHIHARA Takanori.

The Speech Signal Processing Toolkit (SPTK) is a suite of speech
signal processing tools for UNIX environments, e.g., LPC
analysis, PARCOR analysis, LSP analysis, PARCOR synthesis
filter, LSP synthesis filter, vector quantization techniques,
and other extended versions of them.