removed bogus mtrace desc

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2410 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

appendixa/glibc-desc.xml

@@ -49,8 +49,7 @@ library specified on the command line.</para></sect4>
 <para>localedef compiles locale specifications.</para></sect4>
 
 <sect4><title>mtrace</title>
-<para>mtrace prints the multicast path from a source to a receiver (an IP
-trace query).</para></sect4>
+<para>Not yet available.</para></sect4>
 
 <sect4><title>nscd</title>
 <para>nscd is a daemon that provides a cache for the most common name