fix makefile for build ia32 version under x86_64 OS or build x86_64 version under ia32 OS.
After apply this patch,
You can run "make ARCH=ia32" to build elilo-ia32 in x86_64 OS.
Or run "make ARCH=x86_64" to build elilo-x86_64 in ia32 OS.
Rejected, equivalent changes already implemented for release 3.16 in progress.