Now that VC_IMPL usage is down, drop this bad & broken hack.
Now that VC_IMPL usage is down, drop this bad & broken hack.

Previously, the SSE code could only be compiled correctly if VC_IMPL was
set to SSE42Impl. The VC_IMPL dependencies are gone and so is the need
for this hack.

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

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