Adding 'nodump' role to cat /proc/version command

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@6824 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

prologue/hostreqs.xml

@@ -20,7 +20,7 @@ must be sure that all critical system devices get created properly.</para>
 <para>In order to determine whether the host kernel meets the
 requirements outlined above, run the following command:</para>
 
-<screen><userinput>cat /proc/version</userinput></screen>
+<screen role="nodump"><userinput>cat /proc/version</userinput></screen>
 
 <para>This will produce output similar to:</para>