Log Message:
Update sptk to 3.6.
PR pkg/48279 by ISIHARA Takanori.

Version 3.6:
 * add -o option to 'minmax' command to output maximum, minimum or both values.
 * add -o 4 option to 'vstat' command to output medians.
 * add options to 'vopr' command to deal with relational operators, arithmetic/
   geometric mean, and ceiling/flooring.
 * add -T option to 'smcep' command to specifiy emphasized frequency.
 * add -E option to 'gcep', 'mcep', 'mgcep', 'spec', 'smcep' and 'uels' command
   to specify floor in dB.
 * add -F option to 'gmm' command to read initial GMM parameter file.
 * add -L and -R option to 'wav2raw' command to deal with stereo wav file.
 * add 'gseries', 'ifftr', 'mlsacheck', 'symmetrize' and 'transpose' command.
 * change -f option of 'lbg' command into -F option.
 * unify option to specify sampling frequency into -s option.
 * fix 'x2x', 'dmp' and 'fd' command to read format string without space in
   front of '%'.
 * bug fixes.