Added link to sane-devel post.

unsupported/hp-scanjet-2400c.html

@@ -33,6 +33,11 @@
     <p>
     </p>
     <h2>Comments</h2>
+    <p>
+      <a
+      href="http://lists.alioth.debian.org/pipermail/sane-devel/2003-October/009104.html">Someone
+      wants to write a backend</a>.
+    </p>
     <p>
       Looks very similar to the <a href="hp-scanjet-2300c.html">HP ScanJet
       2300c</a>.