arm64: don't create /lib64

The path to dynamic linker is /lib/ld-linux-aarch64.so.1, no hardcoded
/lib64.  It's much better than x86_64 or MIPS64 IMO.

[As a LoongArch contributor & reviewer: we really should have removed
this stupid "64" in the early development stage of LoongArch ELF ABI.]

chapter04/addinguser.xml

@@ -80,10 +80,7 @@ useradd -s /bin/bash -g lfs -m -k /dev/null lfs</userinput></screen>
   all directories under <filename class="directory">$LFS</filename> by making
   <systemitem class="username">lfs</systemitem> the directory owner:</para>
 
-<screen><userinput>chown -v lfs $LFS/{usr{,/*},lib,var,etc,bin,sbin,tools}
-case $(uname -m) in
-  x86_64) chown -v lfs $LFS/lib64 ;;
-esac</userinput></screen>
+<screen><userinput>chown -v lfs $LFS/{usr{,/*},lib,var,etc,bin,sbin,tools}</userinput></screen>
 
   <note><para>In some host systems, the following command does not complete
   properly and suspends the login to the &lfs-user; user to the background.

chapter04/creatingminlayout.xml

@@ -24,11 +24,7 @@
 
 for i in bin lib sbin; do
   ln -sv usr/$i $LFS/$i
-done
-
-case $(uname -m) in
-  x86_64) mkdir -pv $LFS/lib64 ;;
-esac</userinput></screen>
+done</userinput></screen>
 
   <para>Programs in <xref linkend="chapter-temporary-tools"/> will be compiled
   with a cross-compiler (more details in section <xref

chapter07/changingowner.xml

@@ -33,9 +33,6 @@
   user <systemitem class="username">root</systemitem> by running the following
   command:</para>
 
-<screen><userinput>chown -R root:root $LFS/{usr,lib,var,etc,bin,sbin,tools}
-case $(uname -m) in
-  x86_64) chown -R root:root $LFS/lib64 ;;
-esac</userinput></screen>
+<screen><userinput>chown -R root:root $LFS/{usr,lib,var,etc,bin,sbin,tools}</userinput></screen>
 
 </sect1>