Dropped Changelog from PDF output.

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/6.1/BOOK@4893 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter01/changelog.xml

@@ -3,7 +3,7 @@
   <!ENTITY % general-entities SYSTEM "../general.ent">
   %general-entities;
 ]>
-<sect1 id="ch-scatter-changelog">
+<sect1 id="ch-scatter-changelog" condition="html">
 <title>Changelog</title>
 <?dbhtml filename="changelog.html"?>