ui: add optional d3d texture pointer to scanout texture

The following patch will get the underlying D3D11 Texture2D from the
virgl renderer scanout. Pass it along to the texture scanout callbacks
as a priliminary step, to simplify review.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230606115658.677673-20-marcandre.lureau@redhat.com>

ui/sdl2-gl.c

@@ -205,7 +205,8 @@ void sdl2_gl_scanout_texture(DisplayChangeListener *dcl,
                              uint32_t backing_width,
                              uint32_t backing_height,
                              uint32_t x, uint32_t y,
-                             uint32_t w, uint32_t h)
+                             uint32_t w, uint32_t h,
+                             void *d3d_tex2d)
 {
     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);