x86-64, build: Always pass in -mno-sse

Always pass in the -mno-sse argument, regardless if
-preferred-stack-boundary is supported.  We never want to generate SSE
instructions in the kernel unless we *really* know what we're doing.

According to H. J. Lu, any version of gcc new enough that we support
it at all should handle the -mno-sse option, so just add it
unconditionally.

Reported-by: Kevin B. Smith <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: H. J. Lu <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Cc: <[email protected]> # build fix only

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