update SDL3 from 3.2.20 to 3.4.2

libs/SDL3/src/SDL_utils_c.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -67,12 +67,37 @@ typedef enum
 
 extern Uint32 SDL_GetNextObjectID(void);
 extern void SDL_SetObjectValid(void *object, SDL_ObjectType type, bool valid);
-extern bool SDL_ObjectValid(void *object, SDL_ObjectType type);
+extern bool SDL_FindObject(void *object, SDL_ObjectType type);
 extern int SDL_GetObjects(SDL_ObjectType type, void **objects, int count);
 extern void SDL_SetObjectsInvalid(void);
 
+extern bool SDL_object_validation;
+
+SDL_FORCE_INLINE bool SDL_ObjectValid(void *object, SDL_ObjectType type)
+{
+    if (!object) {
+        return false;
+    }
+
+    if (!SDL_object_validation) {
+        return true;
+    }
+
+    return SDL_FindObject(object, type);
+}
+
 extern const char *SDL_GetPersistentString(const char *string);
 
 extern char *SDL_CreateDeviceName(Uint16 vendor, Uint16 product, const char *vendor_name, const char *product_name, const char *default_name);
 
+// Log what backend a subsystem chose, if a hint was set to do so. Useful for debugging.
+extern void SDL_DebugLogBackend(const char *subsystem, const char *backend);
+
+#ifdef SDL_PLATFORM_EMSCRIPTEN
+// even though we reference the C runtime's free() in other places, it appears
+// to be inlined more aggressively in Emscripten 4, so we need a reference to
+// it here, too, so inlined Javascript doesn't fail to find it.
+extern void Emscripten_force_free(void *ptr);
+#endif
+
 #endif // SDL_utils_h_