[Bug-gnubg] Detecting SSE at runtime

[Jon Kinsey]

As the subject suggests I've checked in some code which checks if the
processor has get SSE enabled (when the exe is compiled with
USE_SSE_VECTORIZE).

I did notice a call to NeuralNetEvaluate in FindBestMoveInEval().  Which
doesn't use the 128 equivalent - does anyone know if this is correct?

Anyway in theory (I've only tested it on a P4) a SSE enabled exe should
run fine on an older machine (obviously using the old non-SSE code).  If
anyone has an old pentium or 486 to try it on that would be good.  In
fact any testing would help.

Jon

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