Improved timing accuracy of SDL_WaitEventTimeout() on Windows

We don't need to use the hack of setting a timer and waiting for a timer message, MsgWaitForMultipleObjects() will allow us to wait for input directly with a timeout.

Before this change, sleeping for 20 ms would actually sleep for around 30 ms, with this change the sleep time is pretty accurate at 20-21 ms.

(cherry picked from commit 2670eb4)

src/video/windows/SDL_windowsevents.c

@@ -1802,29 +1802,8 @@ void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata)
 
 int WIN_WaitEventTimeout(_THIS, int timeout)
 {
-    MSG msg;
     if (g_WindowsEnableMessageLoop) {
-        BOOL message_result;
-        UINT_PTR timer_id = 0;
-        if (timeout > 0) {
-            timer_id = SetTimer(NULL, 0, timeout, NULL);
-            message_result = GetMessage(&msg, 0, 0, 0);
-            KillTimer(NULL, timer_id);
-        } else if (timeout == 0) {
-            message_result = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
-        } else {
-            message_result = GetMessage(&msg, 0, 0, 0);
-        }
-        if (message_result) {
-            if (msg.message == WM_TIMER && !msg.hwnd && msg.wParam == timer_id) {
-                return 0;
-            }
-            if (g_WindowsMessageHook) {
-                g_WindowsMessageHook(g_WindowsMessageHookData, msg.hwnd, msg.message, msg.wParam, msg.lParam);
-            }
-            /* Always translate the message in case it's a non-SDL window (e.g. with Qt integration) */
-            TranslateMessage(&msg);
-            DispatchMessage(&msg);
+        if (MsgWaitForMultipleObjects(0, NULL, FALSE, (DWORD)timeout, QS_ALLINPUT)) {
             return 1;
         } else {
             return 0;