Actually let libiberty get installed

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10433 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/gcc.xml

@@ -79,7 +79,6 @@ cd ../gcc-build</userinput></screen>
                        --enable-languages=c,c++    \
                        --disable-multilib          \
                        --disable-bootstrap         \
-                       --disable-install-libiberty \
                        --with-system-zlib</userinput></screen>
 
     <para>Note that for other languages, there are some prerequisites that