WinRT: removed a bit of dead d3d11 code

src/render/direct3d11/SDL_render_d3d11.cpp

@@ -601,15 +601,7 @@ SDLPixelFormatToDXGIFormat(Uint32 sdlFormat)
         default:
             return DXGI_FORMAT_UNKNOWN;
     }
-}
-
-
-//typedef struct
-//{
-//    float x, y, z;
-//    DWORD color;
-//    float u, v;
-//} Vertex;
+}
 
 SDL_Renderer *
 D3D11_CreateRenderer(SDL_Window * window, Uint32 flags)