x86: check for AVX support
This adds configure and runtime checks for AVX support on x86 CPUs. Signed-off-by: NMans Rullgard <mans@mansr.com> (cherry picked from commit 87f1355f)
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This adds configure and runtime checks for AVX support on x86 CPUs. Signed-off-by: NMans Rullgard <mans@mansr.com> (cherry picked from commit 87f1355f)