SSE simd_cast: add missing Vc_INTRINSIC
SSE simd_cast: add missing Vc_INTRINSIC

this is an inline helper function - it showed up with multiple
definitions at link time...

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

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