Remove a command no more needed in gcc

was r11588.

chapter06/gcc.xml

@@ -50,10 +50,6 @@
   ;;
 esac</userinput></screen>
 
-    <para>删除之前创建的符号链接，以便安装最终的 GCC 头文件：</para>
-
-<screen><userinput remap="pre">rm -f /usr/lib/gcc</userinput></screen>
-
     <para>GCC 文档推荐在专用的构建目录中构建 GCC：</para>
 
 <screen><userinput remap="pre">mkdir -v build