configure: enable the surfaceless platform by default

A simple platform that you want to use in a many usecases. See the
spec file details.

It has no special requirements plus it takes less than a second to
build.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
diff --git a/docs/releasing.html b/docs/releasing.html
index 38d59f6..256c2df 100644
--- a/docs/releasing.html
+++ b/docs/releasing.html
@@ -460,7 +460,7 @@
 		--enable-glx-tls \
 		--enable-gbm \
 		--enable-egl \
-		--with-platforms=x11,drm,wayland
+		--with-platforms=x11,drm,wayland,surfaceless
 	make -j2 &amp;&amp; DESTDIR=`pwd`/test make -j6 install
 	__glxinfo_cmd='glxinfo 2>&amp;1 | egrep -o "Mesa.*|Gallium.*|.*dri\.so"'
 	__glxgears_cmd='glxgears 2>&amp;1 | grep -v "configuration file"'