ctest: Use more strict label match
ctest: Use more strict label match

The label argument to ctest_test is a regex. Adding ^ and $ asks for an
exact match. Previously testing AVX would also call the AVX2 tests.

Solves gh-37

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

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