Fixed Visual Studio warning 4389

src/video/SDL_video.c

@@ -4698,7 +4698,7 @@ static SDL_bool SDL_IsMessageboxValidForDriver(const SDL_MessageBoxData *message
     if (window == NULL || SDL_GetWindowWMInfo(window, &info, SDL_SYSWM_CURRENT_VERSION) < 0) {
         return SDL_TRUE;
     } else {
-        return info.subsystem == drivertype;
+        return info.subsystem == (Uint32)drivertype;
     }
 }
 #endif

src/video/windows/SDL_windowskeyboard.c

@@ -1673,7 +1673,7 @@ static void IME_RenderCandidateList(SDL_VideoData *videodata, HDC hdc)
             bottom = size.cy - listborder - listpadding - candmargin;
         }
 
-        if (i == videodata->ime_candsel) {
+        if ((DWORD)i == videodata->ime_candsel) {
             SelectObject(hdc, selpen);
             SelectObject(hdc, selbrush);
             SetTextColor(hdc, seltextcolor);

src/video/yuv2rgb/yuv_rgb_sse_func.h

@@ -491,7 +491,7 @@ void SDL_TARGETING("sse2") SSE_FUNCTION_NAME(uint32_t width, uint32_t height,
 
 	/* Catch the right column, if needed */
 	{
-		int converted = (width & ~31);
+		uint32_t converted = (width & ~31);
 		if (fix_read_nv12) {
 			converted -= 32;
 		}