unsupported: replaced dead link to sm3800 device investigation

The original work seems to have been lost. However, there was some
useful discussion by the same user in the sane-devel archives.

unsupported/microtek-scanmaker-3800.html

@@ -49,7 +49,7 @@ FAGB3-000
     </p>
     <p>
       Damjan Jovanovic <a
-	href="http://ug.ms.wits.ac.za/~jovanod/sm3800/index.html">started to
+	href="https://alioth-lists.debian.net/pipermail/sane-devel/2004-April/010715.html">started to
 	create a backend</a> for that scanner.
     </p>