lto: Disable LTO for sys_ni

The assembler alias code in cond_syscall does not work
when compiled for LTO. Just disable LTO for that file.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391846481-31491-6-git-send-email-ak@linux.intel.com


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>