windows: Manage MapVirtualKey vs Windows XP.

Reference Issue #8666.

src/video/windows/SDL_windowsevents.c

@@ -172,7 +172,7 @@ static SDL_Scancode WindowsScanCodeToSDLScanCode(LPARAM lParam, WPARAM wParam)
 #if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
         /* Windows may not report scan codes for some buttons (multimedia buttons etc).
          * Get scan code from the VK code.*/
-        scanCode = LOWORD(MapVirtualKey(vkCode, MAPVK_VK_TO_VSC_EX));
+        scanCode = LOWORD(MapVirtualKey(vkCode, WIN_IsWindowsXP() ? MAPVK_VK_TO_VSC : MAPVK_VK_TO_VSC_EX));
 #endif /*!defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)*/
 
         /* Pause/Break key have a special scan code with 0xe1 prefix.