Removed SDL_ClearHints() from the public API

Fixes https://github.com/libsdl-org/SDL/issues/9129

include/SDL3/SDL_hints.h

@@ -2661,23 +2661,6 @@ extern DECLSPEC void SDLCALL SDL_DelHintCallback(const char *name,
                                                  SDL_HintCallback callback,
                                                  void *userdata);
 
-/**
- * Clear all hints.
- *
- * 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.
- *
- * \since This function is available since SDL 3.0.0.
- *
- * \sa SDL_ResetHints
- */
-extern DECLSPEC void SDLCALL SDL_ClearHints(void);
-
-
 /* Ends C function definitions when using C++ */
 #ifdef __cplusplus
 }