cmake: Readd AVX2 trigonometric code
cmake: Readd AVX2 trigonometric code

Ouch. I forgot to reenable this after a3b23e8c0. Trig functions in AVX2
code could never compile, no?

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

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