Fixed build when Wayland is dynamically loaded

src/video/SDL_vulkan_internal.h

@@ -46,6 +46,7 @@
 #endif
 #if SDL_VIDEO_DRIVER_WAYLAND
 #define VK_USE_PLATFORM_WAYLAND_KHR
+#include "wayland/SDL_waylanddyn.h"
 #endif
 #if SDL_VIDEO_DRIVER_WINDOWS
 #define VK_USE_PLATFORM_WIN32_KHR