add infodir switch to bc

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/systemd/BOOK@10418 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/bc.xml

@@ -45,6 +45,7 @@
 
 <screen><userinput remap="configure">./configure --prefix=/usr   \
             --with-readline \
+            --infodir=/usr/share/info \
             --mandir=/usr/share/man</userinput></screen>
 
     <variablelist>