Make it clearer that g++ is required on the host.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10240 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

prologue/hostreqs.xml

@@ -61,9 +61,9 @@
     </listitem>
 
     <listitem>
-      <para><emphasis role="strong">GCC-4.1.2</emphasis> (Versions
-      greater than &gcc-version; are not recommended as they have not
-      been tested)</para>
+      <para><emphasis role="strong">GCC-4.1.2</emphasis> including the C++
+      compiler, <command>g++</command> (Versions greater than &gcc-version; are
+      not recommended as they have not been tested)</para>
     </listitem>
 
     <listitem>