Get full path of a previously-specified Timidity config file.
const char* Mix_GetTimidityCfg(void);
Returns the previously-specified path, or NULL if not set.
For example, "/etc/timidity.cfg"
If a path has never been specified, this returns NULL.
This returns a pointer to internal memory, and it should not be modified or free'd by the caller.
This function is available since SDL_mixer 2.6.0.