component/6tunnel: Version up

Simplify the compilation to default cmmi

component/6tunnel/buildout.cfg

@@ -3,17 +3,9 @@
 
 [buildout]
 parts = 6tunnel
-extends =
-  ../autoconf/buildout.cfg
-  ../automake/buildout.cfg
 
 [6tunnel]
 recipe = slapos.recipe.cmmi
 shared = true
-url = https://github.com/wojtekka/6tunnel/releases/download/0.11rc2/6tunnel-0.11rc2.tar.gz
-md5sum = 74e02d4f0704b3083a01feda66033449
-pre-configure =
-  aclocal
-  autoconf
-environment =
-  PATH=${autoconf:location}/bin:${automake:location}/bin:%(PATH)s
+url = https://github.com/wojtekka/6tunnel/releases/download/0.13/6tunnel-0.13.tar.gz
+md5sum = b13ba5ad8efc5d74b2dd71c2df85ef35