Revert "binutils: use -j1 for make install"

This reverts commit 03a41fd0cd.

It's no longer needed after binutils-gdb commit "install dependencies for
ld -> bfd and libctf -> bfd" (755ba58e).

chapter05/binutils-pass1.xml

@@ -131,20 +131,7 @@ cd       build</userinput></screen>
 
     <para>Install the package:</para>
 
-<screen><userinput remap="install">make install -j1</userinput></screen>
-
-    <variablelist>
-      <title>The meaning of the make parameter:</title>
-
-      <varlistentry>
-        <term><parameter>-j1</parameter></term>
-        <listitem>
-          <para>An issue in the building system may cause the installation
-          to fail with <option>-j N</option> in <envar>MAKEFLAGS</envar>.
-          Override it to workaround this issue.</para>
-        </listitem>
-      </varlistentry>
-    </variablelist>
+<screen><userinput remap="install">make install</userinput></screen>
 
   </sect2>
 

chapter06/binutils-pass2.xml

@@ -90,7 +90,7 @@ cd       build</userinput></screen>
     <filename class="libraryfile">libctf.so</filename>
     to link against zlib from the host distribution:</para>
 
-<screen><userinput remap="install">make DESTDIR=$LFS install -j1
+<screen><userinput remap="install">make DESTDIR=$LFS install
 install -vm755 libctf/.libs/libctf.so.0.0.0 $LFS/usr/lib</userinput></screen>
 
   </sect2>

chapter08/binutils.xml

@@ -178,7 +178,7 @@ cd       build</userinput></screen>
  -->
     <para>Install the package:</para>
 
-<screen><userinput remap="install">make tooldir=/usr install -j1</userinput></screen>
+<screen><userinput remap="install">make tooldir=/usr install</userinput></screen>
 
     <para>Remove useless static libraries:</para>