Clear all hints.
Defined in SDL_hints.h
void SDL_ClearHints(void);
This function is automatically called during SDL_Quit(), and deletes all callbacks without calling them and frees all memory associated with hints. If you're calling this from application code you probably want to call SDL_ResetHints() instead.
This function will be removed from the API the next time we rev the ABI.
This function is available since SDL 2.0.0.