Mark config.guess update done.

misc/plan.html

@@ -105,7 +105,7 @@
   </p>
   
   <h2> Build system </h2>
-  <p class='should'>
+  <p class='done'>
     Update config.guess and config.sub. Needed for ppc64le support.    
   </p>
   <p class='should'>