[CentOS] Anaconda allows x86_64 CD/DVD to be used to install i386 system

As subject says.  I just noticed that Anaconda allows x86_64 CD/DVD to  
be used to install i386 system (using network installation, of course).

This is basically broken.  For example, yum will believe that it is  
installed on x86_64, not on i386.  So when you do for example yum  
update, it will try to install x86_64 packages on i386 system.  Which  
isn't going to fly, since installed kernel is 32-bit (so you get  
broken executables).  It can also play havoc with postinstall scripts  
that will detect they are being run under 64-bit kernel during  
installation, but resulting system is really 32-bit.

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