vrend: Signal the guest that we can handle compatibility profiles

Since we use a core context on the host and all parts that are
needed for compatibility profiles are lowered, we can signal the
guest by using the feature check version.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: John Bates <jbates@chromium.org>

src/vrend_renderer.c

@@ -10455,7 +10455,7 @@ static void vrend_renderer_fill_caps_v2(int gl_ver, int gles_ver,  union virgl_c
     * this value to avoid regressions when a guest with a new mesa version is
     * run on an old virgl host. Use it also to indicate non-cap fixes on the
     * host that help enable features in the guest. */
-   caps->v2.host_feature_check_version = 5;
+   caps->v2.host_feature_check_version = 6;
 
    /* Forward host GL_RENDERER to the guest. */
    strncpy(caps->v2.renderer, renderer, sizeof(caps->v2.renderer) - 1);