SDL_thread.h: use SDL_ThreadFunction for SDL_CreateThreadWithStackSize
diff --git a/include/SDL_thread.h b/include/SDL_thread.h
index 35e680d..1e04a4f 100644
--- a/include/SDL_thread.h
+++ b/include/SDL_thread.h
@@ -129,7 +129,7 @@ SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data,
pfnSDL_CurrentEndThread pfnEndThread);
extern DECLSPEC SDL_Thread *SDLCALL
-SDL_CreateThreadWithStackSize(int (SDLCALL * fn) (void *),
+SDL_CreateThreadWithStackSize(SDL_ThreadFunction fn,
const char *name, const size_t stacksize, void *data,
pfnSDL_CurrentBeginThread pfnBeginThread,
pfnSDL_CurrentEndThread pfnEndThread);