Only remove util-linux header symlinks in systemd

Since that's the only book that they are created in.

was r11615.

chapter01/changelog.xml

@@ -43,6 +43,16 @@
     appropriate for the entry or if needed the entire day's listitem.
     -->
 
+    <listitem>
+      <para>2019-06-08</para>
+      <itemizedlist>
+        <listitem>
+          <para>使得在第 6 章中构建 Util-linux
+          前删除符号链接的命令只出现在 systemd 版本中。</para>
+        </listitem>
+      </itemizedlist>
+    </listitem>
+
     <listitem>
       <para>2019-06-03</para>
       <itemizedlist>

chapter06/util-linux.xml

@@ -59,9 +59,9 @@
 <screen><userinput remap="pre">sed -e 's/2^64/(2^64/' -e 's/E &lt;/E) &lt;=/' -e 's/ne /eq /' \
     -i tests/ts/ipcs/limits2</userinput></screen>
 -->
-    <para>删除之前创建的符号链接：</para>
+    <para revision="systemd">删除之前创建的符号链接：</para>
 
-<screen><userinput remap="pre">rm -vf /usr/include/{blkid,libmount,uuid}</userinput></screen>
+<screen revision="systemd"><userinput remap="pre">rm -vf /usr/include/{blkid,libmount,uuid}</userinput></screen>
 
     <para>准备安装 Util-linux：</para>
 

general-orig.ent

@@ -1,13 +1,13 @@
-<!ENTITY version         "SVN-20190603">
+<!ENTITY version         "SVN-20190608">
 <!ENTITY short-version   "svn">  <!-- Used below in &blfs-book; 
                                       Change to x.y for release but not -rc releases -->
 <!ENTITY generic-version "development"> <!-- Use "development"  or "x.y[-pre{x}]" -->
 
-<!ENTITY versiond        "20190603-systemd">
+<!ENTITY versiond        "20190608-systemd">
 <!ENTITY short-versiond  "systemd">
 <!ENTITY generic-versiond "systemd"> 
 
-<!ENTITY releasedate     "June 3, 2019">
+<!ENTITY releasedate     "June 8, 2019">
 
 <!ENTITY copyrightdate   "1999-2019"><!-- jhalfs needs a literal dash, not &ndash; -->
 <!ENTITY milestone       "8.5">