vtest: use VIRGL_RENDERER_THREAD_SYNC

Built-in EGL supports threaded contexts, so enable sync thread.

Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

vtest/vtest_renderer.c

@@ -96,7 +96,9 @@ int vtest_create_renderer(int fd, uint32_t length)
 
     renderer.remote_fd = fd;
 
-    virgl_renderer_init(&renderer, VIRGL_RENDERER_USE_EGL, &vtest_cbs);
+    virgl_renderer_init(&renderer,
+                        VIRGL_RENDERER_USE_EGL |
+                        VIRGL_RENDERER_THREAD_SYNC, &vtest_cbs);
 
     vtestname = malloc(length);
     if (!vtestname)