SDL_waylandvulkan.c: fix type redefinition errors.

Fixes https://github.com/libsdl-org/SDL/issues/9620

src/video/wayland/SDL_waylandvulkan.c

@@ -28,10 +28,11 @@
 
 #if defined(SDL_VIDEO_VULKAN) && defined(SDL_VIDEO_DRIVER_WAYLAND)
 
+#include "../SDL_vulkan_internal.h"
+
 #include "SDL_waylandvideo.h"
 #include "SDL_waylandwindow.h"
 
-#include "../SDL_vulkan_internal.h"
 #include "SDL_waylandvulkan.h"
 
 #ifdef SDL_PLATFORM_OPENBSD