sdl2-compat: fix SDL_AddHintCallback and SDL_DelHintCallback (they are void procs.)

SDL Commits
1 
From e97e987f93374a3fbb4e5be7da7975c884dcce8d Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 30 Dec 2022 00:40:28 +0300
Subject: [PATCH] fix SDL_AddHintCallback and SDL_DelHintCallback (they are
 void procs.)

---
 src/sdl2_compat.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/sdl2_compat.c b/src/sdl2_compat.c
index 94d345e..d52a5c9 100644
--- a/src/sdl2_compat.c
+++ b/src/sdl2_compat.c
@@ -374,13 +374,13 @@ SDL_GetHintBoolean(const char *name, SDL_bool default_value)
 DECLSPEC void SDLCALL
 SDL_AddHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
 {
-    return SDL3_AddHintCallback(SDL2_to_SDL3_hint(name), callback, userdata);
+    SDL3_AddHintCallback(SDL2_to_SDL3_hint(name), callback, userdata);
 }
 
 DECLSPEC void SDLCALL
 SDL_DelHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
 {
-    return SDL3_DelHintCallback(SDL2_to_SDL3_hint(name), callback, userdata);
+    SDL3_DelHintCallback(SDL2_to_SDL3_hint(name), callback, userdata);
 }
 
 static void