make: Remove --without-guile from chapter 6

This seems just a remnant from the pre-cross-chap5 era.  Now with the cross-
toolchain the build system cannot find guile headers and libraries, thus
guile should be disabled by default.

I've also tried this on a host distro with guile installed.

chapter06/make.xml

@@ -45,23 +45,9 @@
     <para>Prepare Make for compilation:</para>
 
 <screen><userinput remap="configure">./configure --prefix=/usr   \
-            --without-guile \
             --host=$LFS_TGT \
             --build=$(build-aux/config.guess)</userinput></screen>
 
-    <variablelist>
-      <title>The meaning of the new configure option:</title>
-
-      <varlistentry>
-        <term><parameter>--without-guile</parameter></term>
-        <listitem>
-          <para>Although we are cross-compiling, configure tries to use
-          guile from the build host if it finds it. This makes compilation
-          fail, so this switch prevents using it.</para>
-        </listitem>
-      </varlistentry>
-    </variablelist>
-
     <para>Compile the package:</para>
 
 <screen><userinput remap="make">make</userinput></screen>