Added yet another variant of autoconf to the list

autogen.sh

@@ -6,7 +6,7 @@ echo "This may take a while ..."
 # Regenerate configuration files
 cp acinclude.m4 aclocal.m4
 found=false
-for autoconf in autoconf autoconf259
+for autoconf in autoconf autoconf259 autoconf-2.59
 do if which $autoconf >/dev/null 2>&1; then $autoconf && found=true; break; fi
 done
 if test x$found = xfalse; then