SoundTouch has two mutually exclusive defines SOUNDTOUCH_FLOAT_SAMPLES and SOUNDTOUCH_INTEGER_SAMPLES. There is a file in the system lib called "soundtouch_config.h" which defines SOUNDTOUCH_FLOAT_SAMPLES. The problem in Citra arises because one of the source files includes "STTypes.h", which includes "soundtouch_config.h", but only on Linux.
If that include didn't exist (the point of the pr), then users would be free to define SOUNDTOUCH_INTEGER_SAMPLES instead. Sorry if I didn't provide enough info before. Regards
