note minor portability update to integer library

[SVN r9796]

index.htm

@@ -54,6 +54,7 @@ with any concerns you don't want to just post to the mailing list.</p>
 <p>Version 1.21.2<p>
 <ul>
   <li><a href="libs/random/index.html">Random Number Library</a>: Split into separate headers, updated documentation, added lagged_fibonacci generator.</li>
+  <li><a href="libs/integer/index.htm">Integer Library</a>: Minor portability update.</li>
 </ul>
 <p>March 14, 2001 - Version 1.21.1</p>
 <ul>