spice-app: fix running when !CONFIG_OPENGL

Do not set 'gl' parameter, fixes:
qemu-system-x86_64: Invalid parameter 'gl'

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20190524130946.31736-7-marcandre.lureau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

ui/spice-app.c

@@ -157,9 +157,10 @@ static void spice_app_display_early_init(DisplayOptions *opts)
     qemu_opt_set(qopts, "addr", sock_path, &error_abort);
     qemu_opt_set(qopts, "image-compression", "off", &error_abort);
     qemu_opt_set(qopts, "streaming-video", "off", &error_abort);
+#ifdef CONFIG_OPENGL
     qemu_opt_set(qopts, "gl", opts->has_gl ? "on" : "off", &error_abort);
     display_opengl = opts->has_gl;
-
+#endif
     be->u.spiceport.data->fqdn = g_strdup("org.qemu.monitor.qmp.0");
     qemu_chardev_new("org.qemu.monitor.qmp", TYPE_CHARDEV_SPICEPORT,
                      be, NULL, &error_abort);