Fix for a misleading fatal error message if a 32-bit crash binary
built on an X86_64 host with "make target=X86" or "make target=ARM"
is used on a live X86_64 system without specifying a vmlinux
namelist.  Without the patch, the session fails with the message
"crash: cannot find booted kernel -- please enter namelist argument".
The error message will be "crash: compiled for the X86 architecture"
or "crash: compiled for the ARM architecture".
(anderson@redhat.com)