Merge topic 'cmp0128_cuda'

ee1396e29e CMP0128: Add flag in OLD mode even when standard matches the default
b2c25de8e0 CMP0128: Avoid test code duplication
3a089cd256 CMP0128: Prefix test names with mode
e13dd52535 XL: Detect default extensions mode for legacy compiler

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6890