Check Windows version before setting window attributes

src/video/windows/SDL_windowswindow.c

@@ -1227,7 +1227,7 @@ static void WIN_UpdateCornerRoundingForHWND(SDL_VideoDevice *_this, HWND hwnd, D
 {
 #if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
     SDL_VideoData *videodata = _this->internal;
-    if (videodata->DwmSetWindowAttribute) {
+    if (videodata->DwmSetWindowAttribute && WIN_IsWindows11OrGreater()) {
         videodata->DwmSetWindowAttribute(hwnd, DWMWA_WINDOW_CORNER_PREFERENCE, &cornerPref, sizeof(cornerPref));
     }
 #endif
@@ -1237,7 +1237,7 @@ static void WIN_UpdateBorderColorForHWND(SDL_VideoDevice *_this, HWND hwnd, COLO
 {
 #if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
     SDL_VideoData *videodata = _this->internal;
-    if (videodata->DwmSetWindowAttribute) {
+    if (videodata->DwmSetWindowAttribute && WIN_IsWindows11OrGreater()) {
         videodata->DwmSetWindowAttribute(hwnd, DWMWA_BORDER_COLOR, &colorRef, sizeof(colorRef));
     }
 #endif