simdize: workaround GCC compile error
simdize: workaround GCC compile error

GCC fails to compile the pack expansion in combination with the alias
template unless it can prove that the template argument list has at
least one argument - which it can't from Ts... . Thus, the fix requires
to use (T, Ts...) instead of only Ts... .

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

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