wined3d: Flush after surface updates.

This is similar to 5d1d07abcf. We need to flush
to ensure resource updates are visible in other contexts, since otherwise GL
doesn't make any ordering guarantees between contexts.

dlls/wined3d/surface.c

@@ -2436,6 +2436,9 @@ void surface_upload_data(const struct wined3d_surface *surface, const struct win
 
     LEAVE_GL();
 
+    if (wined3d_settings.strict_draw_ordering)
+        wglFlush();
+
     if (gl_info->quirks & WINED3D_QUIRK_FBO_TEX_UPDATE)
     {
         struct wined3d_device *device = surface->resource.device;