Avoid multilib conflict in Doxygen documentation with timestamp.

Lubomir Rintel <lkundrak@v3.sk>

diff -up libwpg-0.1.3/docs/doxygen/footer.html.in.nodate libwpg-0.1.3/docs/doxygen/footer.html.in
--- libwpg-0.1.3/docs/doxygen/footer.html.in.nodate	2009-07-28 18:16:27.000000000 +0200
+++ libwpg-0.1.3/docs/doxygen/footer.html.in	2009-07-28 18:17:06.000000000 +0200
@@ -1,5 +1,5 @@
 <hr size="1"><address style="align: right;"><small>
-Generated on $datetime for $projectname by <a href="http://www.doxygen.org/index.html">
+Generated for $projectname by <a href="http://www.doxygen.org/index.html">
 doxygen</a> $doxygenversion</small></address>
 </body>
 </html>