Binutils before 2.21 does not support AVX2
Binutils before 2.21 does not support AVX2

Thanks to Pere Mato Vila <Pere.Mato@cern.ch> for the patch.

Fixes: gh-104
Signed-off-by: Matthias Kretz <372ea4eca737a13cd010ee806d4ce7b98ee71550@kde.org>

chr-engwer/Vc,chr-engwer/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc