disable avx instructions at runtime

[Mike Frysinger]

On Sunday 10 March 2013 09:18:18 tim wrote:
> i'm using a debugger, that does not support avx instructions (at least
> the back-in-time functionality doesn't). unfortunately, glibc/libm uses
> some sort of runtime dispatching to provide an avx-implementation for
> mathematical functions like sin or cos.

yes, it uses cpuid to detect support.  there were bugs though in the 
implementation in older releases that caused it to get used when it shouldn't.  
try using glibc-2.17.
-mike
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