build: update waf to version 2.0.6

Fix discovered build issues

Change-Id: I9a861c955283c1b20cc5065a4baa22bd7c2ab0c1
diff --git a/docs/named_data_theme/named_data_footer.html b/docs/named_data_theme/named_data_footer.html
index 86c022b..8a37816 100644
--- a/docs/named_data_theme/named_data_footer.html
+++ b/docs/named_data_theme/named_data_footer.html
@@ -4,7 +4,7 @@
   <ul>
     $navpath
     <li class="footer">$generatedby
-    <a href="http://www.doxygen.org/index.html">
+    <a href="https://www.doxygen.org/index.html">
     <img class="footer" src="$relpath$doxygen.png" alt="doxygen"/></a> $doxygenversion </li>
   </ul>
 </div>
@@ -18,5 +18,7 @@
 </small></address>
 <!--END !GENERATE_TREEVIEW-->
 
+<script type="text/javascript">
+</script>
 </body>
 </html>