Fix the alpha (and others) module build by only building fdc_acpi.c on i386 and amd64.  The only other ACPI machine (ia64) doesn't support floppy drives.  Tested by:  make MACHINE={pc98,i386,amd64,alpha,sparc64}
Fix the alpha (and others) module build by only building fdc_acpi.c on
i386 and amd64.  The only other ACPI machine (ia64) doesn't support
floppy drives.  Tested by:  make MACHINE={pc98,i386,amd64,alpha,sparc64}

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase