AV_CPU_FLAG_AVX is enabled at this point only if there's OS support.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 2d9821a2)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>